PCRE Compliance

3080 successful tests on 978 patterns.

/the quick brown fox/

(no 1) succeeded 4 of 4 times:

✅ the quick brown fox
✅ What do you know about the quick brown fox?
✅ The quick brown FOX no match
✅ What do you know about THE QUICK BROWN FOX? no match

/The quick brown fox/i

(no 2) succeeded 4 of 4 times:

✅ the quick brown fox
✅ The quick brown FOX
✅ What do you know about the quick brown fox?
✅ What do you know about THE QUICK BROWN FOX?

/abcd\t\n\r\f\a\e\071\x3b\$\\\?caxyz/

(no 3) succeeded 1 of 1 times:

✅ abcd\t\n\r\f\a\e9;$\\?caxyz

/a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz/

(no 4) succeeded 36 of 36 times:

✅ abxyzpqrrrabbxyyyypqAzz
✅ abxyzpqrrrabbxyyyypqAzz
✅ aabxyzpqrrrabbxyyyypqAzz
✅ aaabxyzpqrrrabbxyyyypqAzz
✅ aaaabxyzpqrrrabbxyyyypqAzz
✅ abcxyzpqrrrabbxyyyypqAzz
✅ aabcxyzpqrrrabbxyyyypqAzz
✅ aaabcxyzpqrrrabbxyyyypAzz
✅ aaabcxyzpqrrrabbxyyyypqAzz
✅ aaabcxyzpqrrrabbxyyyypqqAzz
✅ aaabcxyzpqrrrabbxyyyypqqqAzz
✅ aaabcxyzpqrrrabbxyyyypqqqqAzz
✅ aaabcxyzpqrrrabbxyyyypqqqqqAzz
✅ aaabcxyzpqrrrabbxyyyypqqqqqqAzz
✅ aaaabcxyzpqrrrabbxyyyypqAzz
✅ abxyzzpqrrrabbxyyyypqAzz
✅ aabxyzzzpqrrrabbxyyyypqAzz
✅ aaabxyzzzzpqrrrabbxyyyypqAzz
✅ aaaabxyzzzzpqrrrabbxyyyypqAzz
✅ abcxyzzpqrrrabbxyyyypqAzz
✅ aabcxyzzzpqrrrabbxyyyypqAzz
✅ aaabcxyzzzzpqrrrabbxyyyypqAzz
✅ aaaabcxyzzzzpqrrrabbxyyyypqAzz
✅ aaaabcxyzzzzpqrrrabbbxyyyypqAzz
✅ aaaabcxyzzzzpqrrrabbbxyyyyypqAzz
✅ aaabcxyzpqrrrabbxyyyypABzz
✅ aaabcxyzpqrrrabbxyyyypABBzz
✅ >>>aaabxyzpqrrrabbxyyyypqAzz
✅ >aaaabxyzpqrrrabbxyyyypqAzz
✅ >>>>abcxyzpqrrrabbxyyyypqAzz
✅ abxyzpqrrabbxyyyypqAzz no match
✅ abxyzpqrrrrabbxyyyypqAzz no match
✅ abxyzpqrrrabxyyyypqAzz no match
✅ aaaabcxyzzzzpqrrrabbbxyyyyyypqAzz no match
✅ aaaabcxyzzzzpqrrrabbbxyyypqAzz no match
✅ aaabcxyzpqrrrabbxyyyypqqqqqqqAzz no match

/^(abc){1,2}zz/

(no 5) succeeded 5 of 5 times:

✅ abczz
✅ abcabczz
✅ zz no match
✅ abcabcabczz no match
✅ >>abczz no match

/^(b+?|a){1,2}?c/

(no 6) succeeded 10 of 10 times:

✅ bc
✅ bbc
✅ bbbc
✅ bac
✅ bbac
✅ aac
✅ abbbbbbbbbbbc
✅ bbbbbbbbbbbac
✅ aaac no match
✅ abbbbbbbbbbbac no match

/^(b+|a){1,2}c/

(no 7) succeeded 10 of 10 times:

✅ bc
✅ bbc
✅ bbbc
✅ bac
✅ bbac
✅ aac
✅ abbbbbbbbbbbc
✅ bbbbbbbbbbbac
✅ aaac no match
✅ abbbbbbbbbbbac no match

/^(ba|b*){1,2}?bc/

(no 8) succeeded 5 of 5 times:

✅ babc
✅ bbabc
✅ bababc
✅ bababbc no match
✅ babababc no match

/^\ca\cA\c[;\c:/

(no 9) succeeded 1 of 1 times:

✅ \x01\x01\e;z

/^[ab\]cde]/

(no 10) succeeded 9 of 9 times:

✅ athing
✅ bthing
✅ ]thing
✅ cthing
✅ dthing
✅ ething
✅ fthing no match
✅ [thing no match
✅ \\thing no match

/^[]cde]/

(no 11) succeeded 6 of 6 times:

✅ ]thing
✅ cthing
✅ dthing
✅ ething
✅ athing no match
✅ fthing no match

/^[^ab\]cde]/

(no 12) succeeded 9 of 9 times:

✅ fthing
✅ [thing
✅ \\thing
✅ athing no match
✅ bthing no match
✅ ]thing no match
✅ cthing no match
✅ dthing no match
✅ ething no match

/^[^]cde]/

(no 13) succeeded 6 of 6 times:

✅ athing
✅ fthing
✅ ]thing no match
✅ cthing no match
✅ dthing no match
✅ ething no match

/^\201/

(no 14) succeeded 1 of 1 times:

✅ \u81

/^\377/

(no 15) succeeded 1 of 1 times:

✅ ÿ

/^[0-9]+$/

(no 16) succeeded 13 of 13 times:

✅ 0
✅ 1
✅ 2
✅ 3
✅ 4
✅ 5
✅ 6
✅ 7
✅ 8
✅ 9
✅ 10
✅ 100
✅ abc no match

/^.*nter/

(no 17) succeeded 3 of 3 times:

✅ enter
✅ inter
✅ uponter

/^xxx[0-9]+$/

(no 18) succeeded 3 of 3 times:

✅ xxx0
✅ xxx1234
✅ xxx no match

/^.+[0-9][0-9][0-9]$/

(no 19) succeeded 5 of 5 times:

✅ x123
✅ x1234
✅ xx123
✅ 123456
✅ 123 no match

/^.+?[0-9][0-9][0-9]$/

(no 20) succeeded 5 of 5 times:

✅ x123
✅ x1234
✅ xx123
✅ 123456
✅ 123 no match

/^([^!]+)!(.+)=apquxz\.ixr\.zzz\.ac\.uk$/

(no 21) succeeded 5 of 5 times:

✅ abc!pqr=apquxz.ixr.zzz.ac.uk
✅ !pqr=apquxz.ixr.zzz.ac.uk no match
✅ abc!=apquxz.ixr.zzz.ac.uk no match
✅ abc!pqr=apquxz:ixr.zzz.ac.uk no match
✅ abc!pqr=apquxz.ixr.zzz.ac.ukk no match

/:/

(no 22) succeeded 2 of 2 times:

✅ Well, we need a colon: somewhere
✅ Fail without a colon no match

/([\da-f:]+)$/i

(no 23) succeeded 12 of 12 times:

✅ 0abc
✅ abc
✅ fed
✅ E
✅ ::
✅ 5f03:12C0::932e
✅ fed def
✅ Any old stuff
✅ 0zzz no match
✅ gzzz no match
✅ fed no match
✅ Any old rubbish no match

/^.*\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/

(no 24) succeeded 5 of 5 times:

✅ .1.2.3
✅ A.12.123.0
✅ .1.2.3333 no match
✅ 1.2.3 no match
✅ 1234.2.3 no match

/^(\d+)\s+IN\s+SOA\s+(\S+)\s+(\S+)\s*\(\s*$/

(no 25) succeeded 3 of 3 times:

✅ 1 IN SOA non-sp1 non-sp2(
✅ 1 IN SOA non-sp1 non-sp2 (
✅ 1IN SOA non-sp1 non-sp2( no match

/^[a-zA-Z\d][a-zA-Z\d\-]*(\.[a-zA-Z\d][a-zA-z\d\-]*)*\.$/

(no 26) succeeded 7 of 7 times:

✅ a.
✅ Z.
✅ 2.
✅ ab-c.pq-r.
✅ sxk.zzz.ac.uk.
✅ x-.y-.
✅ -abc.peq. no match

/^\*\.[a-z]([a-z\-\d]*[a-z\d]+)?(\.[a-z]([a-z\-\d]*[a-z\d]+)?)*$/

(no 27) succeeded 8 of 8 times:

✅ *.a
✅ *.b0-a
✅ *.c3-b.c
✅ *.c-a.b-c
✅ *.0 no match
✅ *.a- no match
✅ *.a-b.c- no match
✅ *.c-a.0-c no match

/^(?=ab(de))(abd)(e)/

(no 28) succeeded 1 of 1 times:

✅ abde

/^(?!(ab)de|x)(abd)(f)/

(no 29) succeeded 1 of 1 times:

✅ abdf

/^(?=(ab(cd)))(ab)/

(no 30) succeeded 1 of 1 times:

✅ abcd

/^[\da-f](\.[\da-f])*$/i

(no 31) succeeded 3 of 3 times:

✅ a.b.c.d
✅ A.B.C.D
✅ a.b.c.1.2.3.C

/^\".*\"\s*(;.*)?$/

(no 32) succeeded 4 of 4 times:

✅ \"1234\"
✅ \"abcd\" ;
✅ \"\" ; rhubarb
✅ \"1234\" : things no match

/^$/

(no 33) succeeded 2 of 2 times:

✅ ``
✅ A non-empty line no match

/   ^    a   (?# begins with a)  b\sc (?# then b c) $ (?# then end)/x

(no 34) succeeded 3 of 3 times:

✅ ab c
✅ abc no match
✅ ab cde no match

/(?x)   ^    a   (?# begins with a)  b\sc (?# then b c) $ (?# then end)/

(no 35) succeeded 3 of 3 times:

✅ ab c
✅ abc no match
✅ ab cde no match

/^   a\ b[c ]d       $/x

(no 36) succeeded 4 of 4 times:

✅ a bcd
✅ a b d
✅ abcd no match
✅ ab d no match

/^(a(b(c)))(d(e(f)))(h(i(j)))(k(l(m)))$/

(no 37) succeeded 1 of 1 times:

✅ abcdefhijklm

/^(?:a(b(c)))(?:d(e(f)))(?:h(i(j)))(?:k(l(m)))$/

(no 38) succeeded 1 of 1 times:

✅ abcdefhijklm

/^[\w][\W][\s][\S][\d][\D][\b][\n][\c]][\022]/

(no 39) succeeded 1 of 1 times:

✅ a+ Z0+\b\n\x1d\x12

/^[.^$|()*+?{,}]+/

(no 40) succeeded 1 of 1 times:

✅ .^$(*+)|{?,?}

/^a*\w/

(no 41) succeeded 8 of 8 times:

✅ z
✅ az
✅ aaaz
✅ a
✅ aa
✅ aaaa
✅ a+
✅ aa+

/^a*?\w/

(no 42) succeeded 8 of 8 times:

✅ z
✅ az
✅ aaaz
✅ a
✅ aa
✅ aaaa
✅ a+
✅ aa+

/^a+\w/

(no 43) succeeded 5 of 5 times:

✅ az
✅ aaaz
✅ aa
✅ aaaa
✅ aa+

/^a+?\w/

(no 44) succeeded 5 of 5 times:

✅ az
✅ aaaz
✅ aa
✅ aaaa
✅ aa+

/^\d{8}\w{2,}/

(no 45) succeeded 4 of 4 times:

✅ 1234567890
✅ 12345678ab
✅ 12345678__
✅ 1234567 no match

/^[aeiou\d]{4,5}$/

(no 46) succeeded 5 of 5 times:

✅ uoie
✅ 1234
✅ 12345
✅ aaaaa
✅ 123456 no match

/^[aeiou\d]{4,5}?/

(no 47) succeeded 5 of 5 times:

✅ uoie
✅ 1234
✅ 12345
✅ aaaaa
✅ 123456

/\A(abc|def)=(\1){2,3}\Z/

(no 48) succeeded 3 of 3 times:

✅ abc=abcabc
✅ def=defdefdef
✅ abc=defdef no match

/^(a)(b)(c)(d)(e)(f)(g)(h)(i)(j)(k)\11*(\3\4)\1(?#)2$/

(no 49) succeeded 2 of 2 times:

✅ abcdefghijkcda2
✅ abcdefghijkkkkcda2

/(cat(a(ract|tonic)|erpillar)) \1()2(3)/

(no 50) succeeded 3 of 3 times:

✅ cataract cataract23
✅ catatonic catatonic23
✅ caterpillar caterpillar23

/^From +([^ ]+) +[a-zA-Z][a-zA-Z][a-zA-Z] +[a-zA-Z][a-zA-Z][a-zA-Z] +[0-9]?[0-9] +[0-9][0-9]:[0-9][0-9]/

(no 51) succeeded 1 of 1 times:

✅ From abcd Mon Sep 01 12:33:02 1997

/^From\s+\S+\s+([a-zA-Z]{3}\s+){2}\d{1,2}\s+\d\d:\d\d/

(no 52) succeeded 3 of 3 times:

✅ From abcd Mon Sep 01 12:33:02 1997
✅ From abcd Mon Sep 1 12:33:02 1997
✅ From abcd Sep 01 12:33:02 1997 no match

/^12.34/s

(no 53) succeeded 2 of 2 times:

✅ 12\n34
✅ 12\r34

/\w+(?=\t)/

(no 54) succeeded 1 of 1 times:

✅ the quick brown\t fox

/foo(?!bar)(.*)/

(no 55) succeeded 1 of 1 times:

✅ foobar is foolish see?

/(?:(?!foo)...|^.{0,2})bar(.*)/

(no 56) succeeded 4 of 4 times:

✅ foobar crowbar etc
✅ barrel
✅ 2barrel
✅ A barrel

/^(\D*)(?=\d)(?!123)/

(no 57) succeeded 2 of 2 times:

✅ abc456
✅ abc123 no match

/^1234(?# test newlines
  inside)/

(no 58) succeeded 1 of 1 times:

✅ 1234

/^1234 #comment in extended re
  /x

(no 59) succeeded 1 of 1 times:

✅ 1234

/#rhubarb
  abcd/x

(no 60) succeeded 1 of 1 times:

✅ abcd

/^abcd#rhubarb/x

(no 61) succeeded 1 of 1 times:

✅ abcd

/^(a)\1{2,3}(.)/

(no 62) succeeded 4 of 4 times:

✅ aaab
✅ aaaab
✅ aaaaab
✅ aaaaaab

/(?!^)abc/

(no 63) succeeded 2 of 2 times:

✅ the abc
✅ abc no match

/(?=^)abc/

(no 64) succeeded 2 of 2 times:

✅ abc
✅ the abc no match

/^[ab]{1,3}(ab*|b)/

(no 65) succeeded 1 of 1 times:

✅ aabbbbb

/^[ab]{1,3}?(ab*|b)/

(no 66) succeeded 1 of 1 times:

✅ aabbbbb

/^[ab]{1,3}?(ab*?|b)/

(no 67) succeeded 1 of 1 times:

✅ aabbbbb

/^[ab]{1,3}(ab*?|b)/

(no 68) succeeded 1 of 1 times:

✅ aabbbbb

/abc\0def\00pqr\000xyz\0000AB/

(no 71) succeeded 2 of 2 times:

✅ abc\0def\0pqr\0xyz\x000AB
✅ abc456 abc\0def\0pqr\0xyz\x000ABCDE

/abc\x0def\x00pqr\x000xyz\x0000AB/

(no 72) succeeded 2 of 2 times:

✅ abc\ref\0pqr\x000xyz\x0000AB
✅ abc456 abc\ref\0pqr\x000xyz\x0000ABCDE

/^[\000-\037]/

(no 73) succeeded 3 of 3 times:

✅ \0A
✅ \x01B
✅ \x1fC

/\0*/

(no 74) succeeded 1 of 1 times:

✅ \0\0\0\0

/A\x0{2,3}Z/

(no 75) succeeded 4 of 4 times:

✅ The A\0\0Z
✅ An A\0\0\0Z
✅ A\0Z no match
✅ A\0\0\0\0Z no match

/^(cow|)\1(bell)/

(no 76) succeeded 3 of 3 times:

✅ cowcowbell
✅ bell
✅ cowbell no match

/^\s/

(no 77) succeeded 6 of 6 times:

✅ abc
✅ \fabc
✅ \nabc
✅ \rabc
✅ \tabc
✅ abc no match

/^a	b
      c/x

(no 78) succeeded 1 of 1 times:

✅ abc

/^(a|)\1*b/

(no 79) succeeded 4 of 4 times:

✅ ab
✅ aaaab
✅ b
✅ acb no match

/^(a|)\1+b/

(no 80) succeeded 4 of 4 times:

✅ aab
✅ aaaab
✅ b
✅ ab no match

/^(a|)\1?b/

(no 81) succeeded 4 of 4 times:

✅ ab
✅ aab
✅ b
✅ acb no match

/^(a|)\1{2}b/

(no 82) succeeded 5 of 5 times:

✅ aaab
✅ b
✅ ab no match
✅ aab no match
✅ aaaab no match

/^(a|)\1{2,3}b/

(no 83) succeeded 6 of 6 times:

✅ aaab
✅ aaaab
✅ b
✅ ab no match
✅ aab no match
✅ aaaaab no match

/ab{1,3}bc/

(no 84) succeeded 5 of 5 times:

✅ abbbbc
✅ abbbc
✅ abbc
✅ abc no match
✅ abbbbbc no match

/([^.]*)\.([^:]*):[T ]+(.*)/

(no 85) succeeded 1 of 1 times:

✅ track1.title:TBlah blah blah

/([^.]*)\.([^:]*):[T ]+(.*)/i

(no 86) succeeded 1 of 1 times:

✅ track1.title:TBlah blah blah

/([^.]*)\.([^:]*):[t ]+(.*)/i

(no 87) succeeded 1 of 1 times:

✅ track1.title:TBlah blah blah

/^[W-c]+$/

(no 88) succeeded 2 of 2 times:

✅ WXY_^abc
✅ wxy no match

/^abc$/m

(no 91) succeeded 4 of 4 times:

✅ abc
✅ qqq\nabc
✅ abc\nzzz
✅ qqq\nabc\nzzz

/^abc$/

(no 92) succeeded 4 of 4 times:

✅ abc
✅ qqq\nabc no match
✅ abc\nzzz no match
✅ qqq\nabc\nzzz no match

/\Aabc\Z/m

(no 93) succeeded 6 of 6 times:

✅ abc
✅ abc\n
✅ qqq\nabc no match
✅ abc\nzzz no match
✅ qqq\nabc\nzzz no match
✅ `` no match

/\A(.)*\Z/s

(no 94) succeeded 1 of 1 times:

✅ abc\ndef

/\A(.)*\Z/m

(no 95) succeeded 1 of 1 times:

✅ abc\ndef no match

/(?:b)|(?::+)/

(no 96) succeeded 2 of 2 times:

✅ b::c
✅ c::b

/[-az]+/

(no 97) succeeded 2 of 2 times:

✅ az-
✅ b no match

/[az-]+/

(no 98) succeeded 2 of 2 times:

✅ za-
✅ b no match

/[a\-z]+/

(no 99) succeeded 2 of 2 times:

✅ a-z
✅ b no match

/[a-z]+/

(no 100) succeeded 1 of 1 times:

✅ abcdxyz

/[\d-]+/

(no 101) succeeded 2 of 2 times:

✅ 12-34
✅ aaa no match

/\x5c/

(no 102) succeeded 1 of 1 times:

✅ \\

/\x20Z/

(no 103) succeeded 2 of 2 times:

✅ the Zoo
✅ Zulu no match

/(abc)\1/i

(no 104) succeeded 3 of 3 times:

✅ abcabc
✅ ABCabc
✅ abcABC

/abc$/

(no 105) succeeded 3 of 3 times:

✅ abc
✅ abc\n
✅ abc\ndef no match

/(abc)\123/

(no 106) succeeded 1 of 1 times:

✅ abcS

/(abc)\223/

(no 107) succeeded 1 of 1 times:

✅ abc\u93

/(abc)\323/

(no 108) succeeded 1 of 1 times:

✅ abcÓ

/(abc)\100/

(no 109) succeeded 2 of 2 times:

✅ abc@
✅ abc@

/(abc)\1000/

(no 110) succeeded 7 of 7 times:

✅ abc@0
✅ abc@0
✅ abc@0
✅ abc@0
✅ abc@0
✅ abc@0
✅ ``

/^(A)(B)(C)(D)(E)(F)(G)(H)(I)\8\9$/

(no 111) succeeded 1 of 1 times:

✅ ABCDEFGHIHI

/^[A\8B\9C]+$/

(no 112) succeeded 2 of 2 times:

✅ A8B9C
✅ A8B9C\0 no match

/(a)(b)(c)(d)(e)(f)(g)(h)(i)(j)(k)(l)\12\123/

(no 113) succeeded 1 of 1 times:

✅ abcdefghijkllS

/(a)(b)(c)(d)(e)(f)(g)(h)(i)(j)(k)\12\123/

(no 114) succeeded 1 of 1 times:

✅ abcdefghijk\nS

/a{0}bc/

(no 115) succeeded 1 of 1 times:

✅ bc

/(a|(bc)){0,0}?xyz/

(no 116) succeeded 1 of 1 times:

✅ xyz

/abc[\10]de/

(no 117) succeeded 1 of 1 times:

✅ abc\bde

/abc[\1]de/

(no 118) succeeded 1 of 1 times:

✅ abc\x01de

/(abc)[\1]de/

(no 119) succeeded 1 of 1 times:

✅ abc\x01de

/(?s)a.b/

(no 120) succeeded 1 of 1 times:

✅ a\nb

/^([^a])([^\b])([^c]*)([^d]{3,4})/

(no 121) succeeded 7 of 7 times:

✅ baNOTccccd
✅ baNOTcccd
✅ baNOTccd
✅ bacccd
✅ anything no match
✅ bbc no match
✅ baccd no match

/[^a]/

(no 122) succeeded 2 of 2 times:

✅ Abc
✅ ``

/[^a]/i

(no 123) succeeded 1 of 1 times:

✅ Abc

/[^a]+/

(no 124) succeeded 2 of 2 times:

✅ AAAaAbc
✅ ``

/[^a]+/i

(no 125) succeeded 1 of 1 times:

✅ AAAaAbc

/[^a]+/

(no 126) succeeded 2 of 2 times:

✅ bbb\nccc
✅ ``

/[^k]$/

(no 127) succeeded 3 of 3 times:

✅ abc
✅ abk no match
✅ `` no match

/[^k]{2,3}$/

(no 128) succeeded 6 of 6 times:

✅ abc
✅ kbc
✅ kabc
✅ abk no match
✅ akb no match
✅ akk no match

/^\d{8,}\@.+[^k]$/

(no 129) succeeded 4 of 4 times:

✅ 12345678@a.b.c.d
✅ 123456789@x.y.z
✅ 12345678@x.y.uk no match
✅ 1234567@a.b.c.d no match

/(a)\1{8,}/

(no 130) succeeded 3 of 3 times:

✅ aaaaaaaaa
✅ aaaaaaaaaa
✅ aaaaaaa no match

/[^a]/

(no 131) succeeded 2 of 2 times:

✅ aaaabcd
✅ aaAabcd

/[^a]/i

(no 132) succeeded 2 of 2 times:

✅ aaaabcd
✅ aaAabcd

/[^az]/

(no 133) succeeded 2 of 2 times:

✅ aaaabcd
✅ aaAabcd

/[^az]/i

(no 134) succeeded 2 of 2 times:

✅ aaaabcd
✅ aaAabcd

/P[^*]TAIRE[^*]{1,6}?LL/

(no 136) succeeded 1 of 1 times:

✅ xxxxxxxxxxxPSTAIREISLLxxxxxxxxx

/P[^*]TAIRE[^*]{1,}?LL/

(no 137) succeeded 1 of 1 times:

✅ xxxxxxxxxxxPSTAIREISLLxxxxxxxxx

/(\.\d\d[1-9]?)\d+/

(no 138) succeeded 4 of 4 times:

✅ 1.230003938
✅ 1.875000282
✅ 1.235
✅ ``

/(\.\d\d((?=0)|\d(?=\d)))/

(no 139) succeeded 4 of 4 times:

✅ 1.230003938
✅ 1.875000282
✅ 1.235 no match
✅ `` no match

/a(?)b/

(no 140) succeeded 2 of 2 times:

✅ ab
✅ ``

/\b(foo)\s+(\w+)/i

(no 141) succeeded 2 of 2 times:

✅ Food is on the foo table
✅ ``

/foo(.*)bar/

(no 142) succeeded 2 of 2 times:

✅ The food is under the bar in the barn.
✅ ``

/foo(.*?)bar/

(no 143) succeeded 1 of 1 times:

✅ The food is under the bar in the barn.

/(.*)(\d*)/

(no 144) succeeded 2 of 2 times:

✅ I have 2 numbers: 53147
✅ ``

/(.*)(\d+)/

(no 145) succeeded 2 of 2 times:

✅ I have 2 numbers: 53147
✅ ``

/(.*?)(\d*)/

(no 146) succeeded 1 of 1 times:

✅ I have 2 numbers: 53147

/(.*?)(\d+)/

(no 147) succeeded 1 of 1 times:

✅ I have 2 numbers: 53147

/(.*)(\d+)$/

(no 148) succeeded 1 of 1 times:

✅ I have 2 numbers: 53147

/(.*?)(\d+)$/

(no 149) succeeded 1 of 1 times:

✅ I have 2 numbers: 53147

/(.*)\b(\d+)$/

(no 150) succeeded 1 of 1 times:

✅ I have 2 numbers: 53147

/(.*\D)(\d+)$/

(no 151) succeeded 1 of 1 times:

✅ I have 2 numbers: 53147

/^\D*(?!123)/

(no 152) succeeded 2 of 2 times:

✅ ABC123
✅ ``

/^(\D*)(?=\d)(?!123)/

(no 153) succeeded 3 of 3 times:

✅ ABC445
✅ ABC123 no match
✅ `` no match

/^[W-]46]/

(no 154) succeeded 8 of 8 times:

✅ W46]789
✅ -46]789
✅ Wall no match
✅ Zebra no match
✅ 42 no match
✅ [abcd] no match
✅ ]abcd[ no match
✅ `` no match

/^[W-\]46]/

(no 155) succeeded 11 of 11 times:

✅ W46]789
✅ Wall
✅ Zebra
✅ Xylophone
✅ 42
✅ [abcd]
✅ ]abcd[
✅ \\backslash
✅ -46]789 no match
✅ well no match
✅ `` no match

/\d\d\/\d\d\/\d\d\d\d/

(no 156) succeeded 1 of 1 times:

✅ 01/01/2000

/word (?:[a-zA-Z0-9]+ ){0,10}otherword/

(no 157) succeeded 2 of 2 times:

✅ word cat dog elephant mussel cow horse canary baboon snake shark otherword
✅ word cat dog elephant mussel cow horse canary baboon snake shark no match

/word (?:[a-zA-Z0-9]+ ){0,300}otherword/

(no 158) succeeded 1 of 1 times:

✅ word cat dog elephant mussel cow horse canary baboon snake shark the quick brown fox and the lazy dog and several other words getting close to thirty by now I hope no match

/^(a){0,0}/

(no 159) succeeded 3 of 3 times:

✅ bcd
✅ abc
✅ aab

/^(a){0,1}/

(no 160) succeeded 3 of 3 times:

✅ bcd
✅ abc
✅ aab

/^(a){0,2}/

(no 161) succeeded 3 of 3 times:

✅ bcd
✅ abc
✅ aab

/^(a){0,3}/

(no 162) succeeded 4 of 4 times:

✅ bcd
✅ abc
✅ aab
✅ aaa

/^(a){0,}/

(no 163) succeeded 5 of 5 times:

✅ bcd
✅ abc
✅ aab
✅ aaa
✅ aaaaaaaa

/^(a){1,1}/

(no 164) succeeded 3 of 3 times:

✅ abc
✅ aab
✅ bcd no match

/^(a){1,2}/

(no 165) succeeded 3 of 3 times:

✅ abc
✅ aab
✅ bcd no match

/^(a){1,3}/

(no 166) succeeded 4 of 4 times:

✅ abc
✅ aab
✅ aaa
✅ bcd no match

/^(a){1,}/

(no 167) succeeded 5 of 5 times:

✅ abc
✅ aab
✅ aaa
✅ aaaaaaaa
✅ bcd no match

/.*\.gif/

(no 168) succeeded 1 of 1 times:

✅ borfle\nbib.gif\nno

/.{0,}\.gif/

(no 169) succeeded 1 of 1 times:

✅ borfle\nbib.gif\nno

/.*\.gif/m

(no 170) succeeded 1 of 1 times:

✅ borfle\nbib.gif\nno

/.*\.gif/s

(no 171) succeeded 1 of 1 times:

✅ borfle\nbib.gif\nno

/.*\.gif/ms

(no 172) succeeded 2 of 2 times:

✅ borfle\nbib.gif\nno
✅ ``

/.*$/

(no 173) succeeded 1 of 1 times:

✅ borfle\nbib.gif\nno

/.*$/m

(no 174) succeeded 1 of 1 times:

✅ borfle\nbib.gif\nno

/.*$/s

(no 175) succeeded 1 of 1 times:

✅ borfle\nbib.gif\nno

/.*$/ms

(no 176) succeeded 2 of 2 times:

✅ borfle\nbib.gif\nno
✅ ``

/.*$/

(no 177) succeeded 1 of 1 times:

✅ borfle\nbib.gif\nno\n

/.*$/m

(no 178) succeeded 1 of 1 times:

✅ borfle\nbib.gif\nno\n

/.*$/s

(no 179) succeeded 1 of 1 times:

✅ borfle\nbib.gif\nno\n

/.*$/ms

(no 180) succeeded 2 of 2 times:

✅ borfle\nbib.gif\nno\n
✅ ``

/(.*X|^B)/

(no 181) succeeded 3 of 3 times:

✅ abcde\n1234Xyz
✅ BarFoo
✅ abcde\nBar no match

/(.*X|^B)/m

(no 182) succeeded 3 of 3 times:

✅ abcde\n1234Xyz
✅ BarFoo
✅ abcde\nBar

/(.*X|^B)/s

(no 183) succeeded 3 of 3 times:

✅ abcde\n1234Xyz
✅ BarFoo
✅ abcde\nBar no match

/(.*X|^B)/ms

(no 184) succeeded 3 of 3 times:

✅ abcde\n1234Xyz
✅ BarFoo
✅ abcde\nBar

/(?s)(.*X|^B)/

(no 185) succeeded 3 of 3 times:

✅ abcde\n1234Xyz
✅ BarFoo
✅ abcde\nBar no match

/(?s:.*X|^B)/

(no 186) succeeded 3 of 3 times:

✅ abcde\n1234Xyz
✅ BarFoo
✅ abcde\nBar no match

/^.*B/

(no 187) succeeded 2 of 2 times:

✅ abc\nB no match
✅ `` no match

/(?s)^.*B/

(no 188) succeeded 1 of 1 times:

✅ abc\nB

/(?m)^.*B/

(no 189) succeeded 2 of 2 times:

✅ abc\nB
✅ ``

/(?ms)^.*B/

(no 190) succeeded 1 of 1 times:

✅ abc\nB

/(?ms)^B/

(no 191) succeeded 1 of 1 times:

✅ abc\nB

/(?s)B$/

(no 192) succeeded 1 of 1 times:

✅ B\n

/^[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]/

(no 193) succeeded 2 of 2 times:

✅ 123456654321
✅ ``

/^\d\d\d\d\d\d\d\d\d\d\d\d/

(no 194) succeeded 1 of 1 times:

✅ 123456654321

/^[\d][\d][\d][\d][\d][\d][\d][\d][\d][\d][\d][\d]/

(no 195) succeeded 2 of 2 times:

✅ 123456654321
✅ ``

/^[abc]{12}/

(no 196) succeeded 2 of 2 times:

✅ abcabcabcabc
✅ ``

/^[a-c]{12}/

(no 197) succeeded 2 of 2 times:

✅ abcabcabcabc
✅ ``

/^(a|b|c){12}/

(no 198) succeeded 1 of 1 times:

✅ abcabcabcabc

/^[abcdefghijklmnopqrstuvwxy0123456789]/

(no 199) succeeded 2 of 2 times:

✅ n
✅ z no match

/abcde{0,0}/

(no 200) succeeded 2 of 2 times:

✅ abcd
✅ abce no match

/ab[cd]{0,0}e/

(no 201) succeeded 3 of 3 times:

✅ abe
✅ abcde no match
✅ `` no match

/ab(c){0,0}d/

(no 202) succeeded 2 of 2 times:

✅ abd
✅ abcd no match

/a(b*)/

(no 203) succeeded 5 of 5 times:

✅ a
✅ ab
✅ abbbb
✅ bbbbb no match
✅ `` no match

/ab\d{0}e/

(no 204) succeeded 3 of 3 times:

✅ abe
✅ ab1e no match
✅ `` no match

/"([^\\"]+|\\.)*"/

(no 205) succeeded 2 of 2 times:

✅ the \"quick\" brown fox
✅ \"the \\\"quick\\\" brown fox\"

/<tr([\w\W\s\d][^<>]{0,})><TD([\w\W\s\d][^<>]{0,})>([\d]{0,}\.)(.*)((<BR>([\w\W\s\d][^<>]{0,})|[\s]{0,}))<\/a><\/TD><TD([\w\W\s\d][^<>]{0,})>([\w\W\s\d][^<>]{0,})<\/TD><TD([\w\W\s\d][^<>]{0,})>([\w\W\s\d][^<>]{0,})<\/TD><\/TR>/is

(no 210) succeeded 1 of 1 times:

✅ <TR BGCOLOR='#DBE9E9'><TD align=left valign=top>43.<a href='joblist.cfm?JobID=94 6735&Keyword='>Word Processor<BR>(N-1286)</a></TD><TD align=left valign=top>Lega lstaff.com</TD><TD align=left valign=top>CA - Statewide</TD></TR>

/a[^a]b/

(no 211) succeeded 3 of 3 times:

✅ acb
✅ a\nb
✅ ``

/a.b/

(no 212) succeeded 3 of 3 times:

✅ acb
✅ a\nb no match
✅ `` no match

/a[^a]b/s

(no 213) succeeded 3 of 3 times:

✅ acb
✅ a\nb
✅ ``

/a.b/s

(no 214) succeeded 2 of 2 times:

✅ acb
✅ a\nb

/^(b+?|a){1,2}?c/

(no 215) succeeded 5 of 5 times:

✅ bac
✅ bbac
✅ bbbac
✅ bbbbac
✅ bbbbbac

/^(b+|a){1,2}?c/

(no 216) succeeded 6 of 6 times:

✅ bac
✅ bbac
✅ bbbac
✅ bbbbac
✅ bbbbbac
✅ ``

/(?!\A)x/m

(no 217) succeeded 4 of 4 times:

✅ abx\n
✅ a\nx\n
✅ x\nb\n no match
✅ `` no match

/(A|B)*?CD/

(no 218) succeeded 2 of 2 times:

✅ CD
✅ ``

/(A|B)*CD/

(no 219) succeeded 1 of 1 times:

✅ CD

/(AB)*?\1/

(no 220) succeeded 1 of 1 times:

✅ ABABAB

/(AB)*\1/

(no 221) succeeded 2 of 2 times:

✅ ABABAB
✅ ``

/(?<!bar)foo/

(no 222) succeeded 6 of 6 times:

✅ foo
✅ catfood
✅ arfootle
✅ rfoosh
✅ barfoo no match
✅ towbarfoo no match

/\w{3}(?<!bar)foo/

(no 223) succeeded 4 of 4 times:

✅ catfood
✅ foo no match
✅ barfoo no match
✅ towbarfoo no match

/(?<=(foo)a)bar/

(no 224) succeeded 4 of 4 times:

✅ fooabar
✅ bar no match
✅ foobbar no match
✅ `` no match

/\Aabc\z/m

(no 225) succeeded 5 of 5 times:

✅ abc
✅ abc\n no match
✅ qqq\nabc no match
✅ abc\nzzz no match
✅ qqq\nabc\nzzz no match

/(?>.*/)foo/

(no 226) succeeded 2 of 2 times:

✅ /this/is/a/very/long/line/in/deed/with/very/many/slashes/in/and/foo
✅ /this/is/a/very/long/line/in/deed/with/very/many/slashes/in/it/you/see/ no match

/(?>(\.\d\d[1-9]?))\d+/

(no 227) succeeded 3 of 3 times:

✅ 1.230003938
✅ 1.875000282
✅ 1.235 no match

/^((?>\w+)|(?>\s+))*$/

(no 228) succeeded 2 of 2 times:

✅ now is the time for all good men to come to the aid of the party
✅ this is not a line with only words and spaces! no match

/(\d+)(\w)/

(no 229) succeeded 2 of 2 times:

✅ 12345a
✅ 12345+

/((?>\d+))(\w)/

(no 230) succeeded 2 of 2 times:

✅ 12345a
✅ 12345+ no match

/(?>a+)b/

(no 231) succeeded 1 of 1 times:

✅ aaab

/((?>a+)b)/

(no 232) succeeded 1 of 1 times:

✅ aaab

/(?>(a+))b/

(no 233) succeeded 1 of 1 times:

✅ aaab

/(?>b)+/

(no 234) succeeded 1 of 1 times:

✅ aaabbbccc

/(?>a+|b+|c+)*c/

(no 235) succeeded 1 of 1 times:

✅ aaabbbbccccd

/((?>[^()]+)|\([^()]*\))+/

(no 236) succeeded 2 of 2 times:

✅ ((abc(ade)ufh()()x
✅ ``

/\(((?>[^()]+)|\([^()]+\))+\)/

(no 237) succeeded 3 of 3 times:

✅ (abc)
✅ (abc(def)xyz)
✅ ((()aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa no match

/a(?-i)b/i

(no 238) succeeded 5 of 5 times:

✅ ab
✅ Ab
✅ aB no match
✅ AB no match
✅ `` no match

/(a (?x)b c)d e/

(no 239) succeeded 5 of 5 times:

✅ a bcd e
✅ a b cd e no match
✅ abcd e no match
✅ a bcde no match
✅ `` no match

/(a b(?x)c d (?-x)e f)/

(no 240) succeeded 2 of 2 times:

✅ a bcde f
✅ abcdef no match

/(a(?i)b)c/

(no 241) succeeded 9 of 9 times:

✅ abc
✅ aBc
✅ abC no match
✅ aBC no match
✅ Abc no match
✅ ABc no match
✅ ABC no match
✅ AbC no match
✅ `` no match

/a(?i:b)c/

(no 242) succeeded 6 of 6 times:

✅ abc
✅ aBc
✅ ABC no match
✅ abC no match
✅ aBC no match
✅ `` no match

/a(?i:b)*c/

(no 243) succeeded 5 of 5 times:

✅ aBc
✅ aBBc
✅ aBC no match
✅ aBBC no match
✅ `` no match

/a(?=b(?i)c)\w\wd/

(no 244) succeeded 5 of 5 times:

✅ abcd
✅ abCd
✅ aBCd no match
✅ abcD no match
✅ `` no match

/(?s-i:more.*than).*million/i

(no 245) succeeded 5 of 5 times:

✅ more than million
✅ more than MILLION
✅ more \n than Million
✅ MORE THAN MILLION no match
✅ more \n than \n million no match

/(?:(?s-i)more.*than).*million/i

(no 246) succeeded 6 of 6 times:

✅ more than million
✅ more than MILLION
✅ more \n than Million
✅ MORE THAN MILLION no match
✅ more \n than \n million no match
✅ `` no match

/(?>a(?i)b+)+c/

(no 247) succeeded 7 of 7 times:

✅ abc
✅ aBbc
✅ aBBc
✅ Abc no match
✅ abAb no match
✅ abbC no match
✅ `` no match

/(?=a(?i)b)\w\wc/

(no 248) succeeded 6 of 6 times:

✅ abc
✅ aBc
✅ Ab no match
✅ abC no match
✅ aBC no match
✅ `` no match

/(?<=a(?i)b)(\w\w)c/

(no 249) succeeded 5 of 5 times:

✅ abxxc
✅ aBxxc
✅ Abxxc no match
✅ ABxxc no match
✅ abxxC no match

/(?:(a)|b)(?(1)A|B)/

(no 250) succeeded 4 of 4 times:

✅ aA
✅ bB
✅ aB no match
✅ bA no match

/^(a)?(?(1)a|b)+$/

(no 251) succeeded 5 of 5 times:

✅ aa
✅ b
✅ bb
✅ ab no match
✅ `` no match

/^(?(?=abc)\w{3}:|\d\d)/

(no 252) succeeded 4 of 4 times:

✅ abc:
✅ 12
✅ 123
✅ xyz no match

/^(?(?!abc)\d\d|\w{3}:)$/

(no 253) succeeded 5 of 5 times:

✅ abc:
✅ 12
✅ 123 no match
✅ xyz no match
✅ `` no match

/(?(?<=foo)bar|cat)/

(no 254) succeeded 5 of 5 times:

✅ foobar
✅ cat
✅ fcat
✅ focat
✅ foocat no match

/(?(?<!foo)cat|bar)/

(no 255) succeeded 5 of 5 times:

✅ foobar
✅ cat
✅ fcat
✅ focat
✅ foocat no match

/( \( )? [^()]+ (?(1) \) |) /x

(no 256) succeeded 4 of 4 times:

✅ abcd
✅ (abcd)
✅ the quick (abcd) fox
✅ (abcd

/( \( )? [^()]+ (?(1) \) ) /x

(no 257) succeeded 4 of 4 times:

✅ abcd
✅ (abcd)
✅ the quick (abcd) fox
✅ (abcd

/^(?(2)a|(1)(2))+$/

(no 258) succeeded 4 of 4 times:

✅ 12
✅ 12a
✅ 12aa
✅ 1234 no match

/((?i)blah)\s+\1/

(no 259) succeeded 7 of 7 times:

✅ blah blah
✅ BLAH BLAH
✅ Blah Blah
✅ blaH blaH
✅ blah BLAH no match
✅ Blah blah no match
✅ blaH blah no match

/((?i)blah)\s+(?i:\1)/

(no 260) succeeded 7 of 7 times:

✅ blah blah
✅ BLAH BLAH
✅ Blah Blah
✅ blaH blaH
✅ blah BLAH
✅ Blah blah
✅ blaH blah

/((?i)blah)\s+(?m)A(?i:\1)/

(no 261) succeeded 2 of 2 times:

✅ blah ABLAH
✅ blah aBLAH no match

/(?>a*)*/

(no 262) succeeded 4 of 4 times:

✅ a
✅ aa
✅ aaaa
✅ ``

/(abc|)+/

(no 263) succeeded 4 of 4 times:

✅ abc
✅ abcabc
✅ abcabcabc
✅ xyz

/([a]*)*/

(no 264) succeeded 3 of 3 times:

✅ a
✅ aaaaa
✅ ``

/([ab]*)*/

(no 265) succeeded 6 of 6 times:

✅ a
✅ b
✅ ababab
✅ aaaabcde
✅ bbbb
✅ ``

/([^a]*)*/

(no 266) succeeded 4 of 4 times:

✅ b
✅ bbbb
✅ aaa
✅ ``

/([^ab]*)*/

(no 267) succeeded 3 of 3 times:

✅ cccc
✅ abab
✅ ``

/([a]*?)*/

(no 268) succeeded 3 of 3 times:

✅ a
✅ aaaa
✅ ``

/([ab]*?)*/

(no 269) succeeded 5 of 5 times:

✅ a
✅ b
✅ abab
✅ baba
✅ ``

/([^a]*?)*/

(no 270) succeeded 4 of 4 times:

✅ b
✅ bbbb
✅ aaa
✅ ``

/([^ab]*?)*/

(no 271) succeeded 4 of 4 times:

✅ c
✅ cccc
✅ baba
✅ ``

/(?>a*)*/

(no 272) succeeded 3 of 3 times:

✅ a
✅ aaabcde
✅ ``

/((?>a*))*/

(no 273) succeeded 3 of 3 times:

✅ aaaaa
✅ aabbaa
✅ ``

/((?>a*?))*/

(no 274) succeeded 2 of 2 times:

✅ aaaaa
✅ aabbaa

/(?(?=[^a-z]+[a-z])  \d{2}-[a-z]{3}-\d{2}  |  \d{2}-\d{2}-\d{2} ) /x

(no 275) succeeded 4 of 4 times:

✅ 12-sep-98
✅ 12-09-98
✅ sep-12-98 no match
✅ `` no match

/(?<=(foo))bar\1/

(no 276) succeeded 4 of 4 times:

✅ foobarfoo
✅ foobarfootling
✅ foobar no match
✅ barfoo no match

/(?i:saturday|sunday)/

(no 277) succeeded 8 of 8 times:

✅ saturday
✅ sunday
✅ Saturday
✅ Sunday
✅ SATURDAY
✅ SUNDAY
✅ SunDay
✅ ``

/(a(?i)bc|BB)x/

(no 278) succeeded 8 of 8 times:

✅ abcx
✅ aBCx
✅ bbx
✅ BBx
✅ abcX no match
✅ aBCX no match
✅ bbX no match
✅ BBX no match

/^([ab](?i)[cd]|[ef])/

(no 279) succeeded 8 of 8 times:

✅ ac
✅ aC
✅ bD
✅ elephant
✅ Europe
✅ frog
✅ France
✅ Africa no match

/^(ab|a(?i)[b-c](?m-i)d|x(?i)y|z)/

(no 280) succeeded 8 of 8 times:

✅ ab
✅ aBd
✅ xy
✅ xY
✅ zebra
✅ Zambesi
✅ aCD no match
✅ XY no match

/(?<=foo\n)^bar/m

(no 281) succeeded 3 of 3 times:

✅ foo\nbar
✅ bar no match
✅ baz\nbar no match

/(?<=(?<!foo)bar)baz/

(no 282) succeeded 5 of 5 times:

✅ barbaz
✅ barbarbaz
✅ koobarbaz
✅ baz no match
✅ foobarbaz no match

/^(a\1?){4}$/

(no 283) succeeded 14 of 14 times:

✅ aaaaa
✅ aaaaaaa
✅ aaaaaaaaaa
✅ a no match
✅ aa no match
✅ aaa no match
✅ aaaaaaaa no match
✅ aaaaaaaaa no match
✅ aaaaaaaaaaa no match
✅ aaaaaaaaaaaa no match
✅ aaaaaaaaaaaaa no match
✅ aaaaaaaaaaaaaa no match
✅ aaaaaaaaaaaaaaa no match
✅ aaaaaaaaaaaaaaaa no match

/^(a\1?)(a\1?)(a\2?)(a\3?)$/

(no 284) succeeded 16 of 16 times:

✅ aaaa
✅ aaaaa
✅ aaaaaa
✅ aaaaaaa
✅ aaaaaaaaaa
✅ a no match
✅ aa no match
✅ aaa no match
✅ aaaaaaaa no match
✅ aaaaaaaaa no match
✅ aaaaaaaaaaa no match
✅ aaaaaaaaaaaa no match
✅ aaaaaaaaaaaaa no match
✅ aaaaaaaaaaaaaa no match
✅ aaaaaaaaaaaaaaa no match
✅ aaaaaaaaaaaaaaaa no match

/abc/

(no 285) succeeded 6 of 6 times:

✅ abc
✅ xabcy
✅ ababc
✅ xbc no match
✅ axc no match
✅ abx no match

/ab*c/

(no 286) succeeded 1 of 1 times:

✅ abc

/ab*bc/

(no 287) succeeded 3 of 3 times:

✅ abc
✅ abbc
✅ abbbbc

/.{1}/

(no 288) succeeded 1 of 1 times:

✅ abbbbc

/.{3,4}/

(no 289) succeeded 1 of 1 times:

✅ abbbbc

/ab{0,}bc/

(no 290) succeeded 1 of 1 times:

✅ abbbbc

/ab+bc/

(no 291) succeeded 3 of 3 times:

✅ abbc
✅ abc no match
✅ abq no match

/ab{1,}bc/

(no 292) succeeded 0 of 0 times:

/ab+bc/

(no 293) succeeded 1 of 1 times:

✅ abbbbc

/ab{1,}bc/

(no 294) succeeded 1 of 1 times:

✅ abbbbc

/ab{1,3}bc/

(no 295) succeeded 1 of 1 times:

✅ abbbbc

/ab{3,4}bc/

(no 296) succeeded 1 of 1 times:

✅ abbbbc

/ab{4,5}bc/

(no 297) succeeded 2 of 2 times:

✅ abq no match
✅ abbbbc no match

/ab?bc/

(no 298) succeeded 2 of 2 times:

✅ abbc
✅ abc

/ab{0,1}bc/

(no 299) succeeded 1 of 1 times:

✅ abc

/ab?bc/

(no 300) succeeded 0 of 0 times:

/ab?c/

(no 301) succeeded 1 of 1 times:

✅ abc

/ab{0,1}c/

(no 302) succeeded 1 of 1 times:

✅ abc

/^abc$/

(no 303) succeeded 3 of 3 times:

✅ abc
✅ abbbbc no match
✅ abcc no match

/^abc/

(no 304) succeeded 1 of 1 times:

✅ abcc

/^abc$/

(no 305) succeeded 0 of 0 times:

/abc$/

(no 306) succeeded 2 of 2 times:

✅ aabc
✅ aabcd no match

/^/

(no 307) succeeded 1 of 1 times:

✅ abc

/$/

(no 308) succeeded 1 of 1 times:

✅ abc

/a.c/

(no 309) succeeded 2 of 2 times:

✅ abc
✅ axc

/a.*c/

(no 310) succeeded 1 of 1 times:

✅ axyzc

/a[bc]d/

(no 311) succeeded 3 of 3 times:

✅ abd
✅ axyzd no match
✅ abc no match

/a[b-d]e/

(no 312) succeeded 1 of 1 times:

✅ ace

/a[b-d]/

(no 313) succeeded 1 of 1 times:

✅ aac

/a[-b]/

(no 314) succeeded 1 of 1 times:

✅ a-

/a[b-]/

(no 315) succeeded 1 of 1 times:

✅ a-

/a]/

(no 316) succeeded 1 of 1 times:

✅ a]

/a[]]b/

(no 317) succeeded 1 of 1 times:

✅ a]b

/a[^bc]d/

(no 318) succeeded 3 of 3 times:

✅ aed
✅ abd no match
✅ abd no match

/a[^-b]c/

(no 319) succeeded 1 of 1 times:

✅ adc

/a[^]b]c/

(no 320) succeeded 3 of 3 times:

✅ adc
✅ a-c
✅ a]c no match

/\ba\b/

(no 321) succeeded 3 of 3 times:

✅ a-
✅ -a
✅ -a-

/\by\b/

(no 322) succeeded 3 of 3 times:

✅ xy no match
✅ yz no match
✅ xyz no match

/\Ba\B/

(no 323) succeeded 3 of 3 times:

✅ a- no match
✅ -a no match
✅ -a- no match

/\By\b/

(no 324) succeeded 1 of 1 times:

✅ xy

/\by\B/

(no 325) succeeded 1 of 1 times:

✅ yz

/\By\B/

(no 326) succeeded 1 of 1 times:

✅ xyz

/\w/

(no 327) succeeded 1 of 1 times:

✅ a

/\W/

(no 328) succeeded 2 of 2 times:

✅ -
✅ a no match

/a\sb/

(no 329) succeeded 1 of 1 times:

✅ a b

/a\Sb/

(no 330) succeeded 2 of 2 times:

✅ a-b
✅ a b no match

/\d/

(no 331) succeeded 1 of 1 times:

✅ 1

/\D/

(no 332) succeeded 2 of 2 times:

✅ -
✅ 1 no match

/[\w]/

(no 333) succeeded 1 of 1 times:

✅ a

/[\W]/

(no 334) succeeded 2 of 2 times:

✅ -
✅ a no match

/a[\s]b/

(no 335) succeeded 1 of 1 times:

✅ a b

/a[\S]b/

(no 336) succeeded 2 of 2 times:

✅ a-b
✅ a b no match

/[\d]/

(no 337) succeeded 1 of 1 times:

✅ 1

/[\D]/

(no 338) succeeded 2 of 2 times:

✅ -
✅ 1 no match

/ab|cd/

(no 339) succeeded 2 of 2 times:

✅ abc
✅ abcd

/()ef/

(no 340) succeeded 1 of 1 times:

✅ def

/$b/

(no 341) succeeded 0 of 0 times:

/a\(b/

(no 342) succeeded 1 of 1 times:

✅ a(b

/a\(*b/

(no 343) succeeded 2 of 2 times:

✅ ab
✅ a((b

/a\\b/

(no 344) succeeded 1 of 1 times:

✅ a\\b

/((a))/

(no 345) succeeded 1 of 1 times:

✅ abc

/(a)b(c)/

(no 346) succeeded 1 of 1 times:

✅ abc

/a+b+c/

(no 347) succeeded 1 of 1 times:

✅ aabbabc

/a{1,}b{1,}c/

(no 348) succeeded 1 of 1 times:

✅ aabbabc

/a.+?c/

(no 349) succeeded 1 of 1 times:

✅ abcabc

/(a+|b)*/

(no 350) succeeded 1 of 1 times:

✅ ab

/(a+|b){0,}/

(no 351) succeeded 1 of 1 times:

✅ ab

/(a+|b)+/

(no 352) succeeded 1 of 1 times:

✅ ab

/(a+|b){1,}/

(no 353) succeeded 1 of 1 times:

✅ ab

/(a+|b)?/

(no 354) succeeded 1 of 1 times:

✅ ab

/(a+|b){0,1}/

(no 355) succeeded 1 of 1 times:

✅ ab

/[^ab]*/

(no 356) succeeded 1 of 1 times:

✅ cde

/abc/

(no 357) succeeded 1 of 1 times:

✅ b no match

/a*/

(no 358) succeeded 1 of 1 times:

✅ ``

/([abc])*d/

(no 359) succeeded 1 of 1 times:

✅ abbbcd

/([abc])*bcd/

(no 360) succeeded 1 of 1 times:

✅ abcd

/a|b|c|d|e/

(no 361) succeeded 1 of 1 times:

✅ e

/(a|b|c|d|e)f/

(no 362) succeeded 1 of 1 times:

✅ ef

/abcd*efg/

(no 363) succeeded 1 of 1 times:

✅ abcdefg

/ab*/

(no 364) succeeded 2 of 2 times:

✅ xabyabbbz
✅ xayabbbz

/(ab|cd)e/

(no 365) succeeded 1 of 1 times:

✅ abcde

/[abhgefdc]ij/

(no 366) succeeded 1 of 1 times:

✅ hij

/^(ab|cd)e/

(no 367) succeeded 0 of 0 times:

/(abc|)ef/

(no 368) succeeded 1 of 1 times:

✅ abcdef

/(a|b)c*d/

(no 369) succeeded 1 of 1 times:

✅ abcd

/(ab|ab*)bc/

(no 370) succeeded 1 of 1 times:

✅ abc

/a([bc]*)c*/

(no 371) succeeded 1 of 1 times:

✅ abc

/a([bc]*)(c*d)/

(no 372) succeeded 1 of 1 times:

✅ abcd

/a([bc]+)(c*d)/

(no 373) succeeded 1 of 1 times:

✅ abcd

/a([bc]*)(c+d)/

(no 374) succeeded 1 of 1 times:

✅ abcd

/a[bcd]*dcdcde/

(no 375) succeeded 1 of 1 times:

✅ adcdcde

/a[bcd]+dcdcde/

(no 376) succeeded 2 of 2 times:

✅ abcde no match
✅ adcdcde no match

/(ab|a)b*c/

(no 377) succeeded 1 of 1 times:

✅ abc

/((a)(b)c)(d)/

(no 378) succeeded 1 of 1 times:

✅ abcd

/[a-zA-Z_][a-zA-Z0-9_]*/

(no 379) succeeded 1 of 1 times:

✅ alpha

/^a(bc+|b[eh])g|.h$/

(no 380) succeeded 1 of 1 times:

✅ abh

/(bc+d$|ef*g.|h?i(j|k))/

(no 381) succeeded 5 of 5 times:

✅ effgz
✅ ij
✅ reffgz
✅ effg no match
✅ bcdd no match

/((((((((((a))))))))))/

(no 382) succeeded 1 of 1 times:

✅ a

/((((((((((a))))))))))\10/

(no 383) succeeded 1 of 1 times:

✅ aa

/(((((((((a)))))))))/

(no 384) succeeded 1 of 1 times:

✅ a

/multiple words of text/

(no 385) succeeded 2 of 2 times:

✅ aa no match
✅ uh-uh no match

/multiple words/

(no 386) succeeded 1 of 1 times:

✅ multiple words, yeah

/(.*)c(.*)/

(no 387) succeeded 1 of 1 times:

✅ abcde

/\((.*), (.*)\)/

(no 388) succeeded 1 of 1 times:

✅ (a, b)

/[k]/

(no 389) succeeded 0 of 0 times:

/abcd/

(no 390) succeeded 1 of 1 times:

✅ abcd

/a(bc)d/

(no 391) succeeded 1 of 1 times:

✅ abcd

/a[-]?c/

(no 392) succeeded 1 of 1 times:

✅ ac

/(abc)\1/

(no 393) succeeded 1 of 1 times:

✅ abcabc

/([a-c]*)\1/

(no 394) succeeded 1 of 1 times:

✅ abcabc

/(a)|\1/

(no 395) succeeded 3 of 3 times:

✅ a
✅ ab
✅ x no match

/(([a-c])b*?\2)*/

(no 396) succeeded 1 of 1 times:

✅ ababbbcbc

/((\3|b)\2(a)x)+/

(no 398) succeeded 1 of 1 times:

✅ aaaxabaxbaaxbbax

/abc/i

(no 400) succeeded 7 of 7 times:

✅ ABC
✅ XABCY
✅ ABABC
✅ aaxabxbaxbbx no match
✅ XBC no match
✅ AXC no match
✅ ABX no match

/ab*c/i

(no 401) succeeded 1 of 1 times:

✅ ABC

/ab*bc/i

(no 402) succeeded 2 of 2 times:

✅ ABC
✅ ABBC

/ab*?bc/i

(no 403) succeeded 1 of 1 times:

✅ ABBBBC

/ab{0,}?bc/i

(no 404) succeeded 1 of 1 times:

✅ ABBBBC

/ab+?bc/i

(no 405) succeeded 1 of 1 times:

✅ ABBC

/ab+bc/i

(no 406) succeeded 2 of 2 times:

✅ ABC no match
✅ ABQ no match

/ab{1,}bc/i

(no 407) succeeded 0 of 0 times:

/ab+bc/i

(no 408) succeeded 1 of 1 times:

✅ ABBBBC

/ab{1,}?bc/i

(no 409) succeeded 1 of 1 times:

✅ ABBBBC

/ab{1,3}?bc/i

(no 410) succeeded 1 of 1 times:

✅ ABBBBC

/ab{3,4}?bc/i

(no 411) succeeded 1 of 1 times:

✅ ABBBBC

/ab{4,5}?bc/i

(no 412) succeeded 2 of 2 times:

✅ ABQ no match
✅ ABBBBC no match

/ab??bc/i

(no 413) succeeded 2 of 2 times:

✅ ABBC
✅ ABC

/ab{0,1}?bc/i

(no 414) succeeded 1 of 1 times:

✅ ABC

/ab??bc/i

(no 415) succeeded 0 of 0 times:

/ab??c/i

(no 416) succeeded 1 of 1 times:

✅ ABC

/ab{0,1}?c/i

(no 417) succeeded 1 of 1 times:

✅ ABC

/^abc$/i

(no 418) succeeded 3 of 3 times:

✅ ABC
✅ ABBBBC no match
✅ ABCC no match

/^abc/i

(no 419) succeeded 1 of 1 times:

✅ ABCC

/^abc$/i

(no 420) succeeded 0 of 0 times:

/abc$/i

(no 421) succeeded 1 of 1 times:

✅ AABC

/^/i

(no 422) succeeded 1 of 1 times:

✅ ABC

/$/i

(no 423) succeeded 1 of 1 times:

✅ ABC

/a.c/i

(no 424) succeeded 2 of 2 times:

✅ ABC
✅ AXC

/a.*?c/i

(no 425) succeeded 1 of 1 times:

✅ AXYZC

/a.*c/i

(no 426) succeeded 2 of 2 times:

✅ AABC
✅ AXYZD no match

/a[bc]d/i

(no 427) succeeded 1 of 1 times:

✅ ABD

/a[b-d]e/i

(no 428) succeeded 3 of 3 times:

✅ ACE
✅ ABC no match
✅ ABD no match

/a[b-d]/i

(no 429) succeeded 1 of 1 times:

✅ AAC

/a[-b]/i

(no 430) succeeded 1 of 1 times:

✅ A-

/a[b-]/i

(no 431) succeeded 1 of 1 times:

✅ A-

/a]/i

(no 432) succeeded 1 of 1 times:

✅ A]

/a[]]b/i

(no 433) succeeded 1 of 1 times:

✅ A]B

/a[^bc]d/i

(no 434) succeeded 1 of 1 times:

✅ AED

/a[^-b]c/i

(no 435) succeeded 3 of 3 times:

✅ ADC
✅ ABD no match
✅ A-C no match

/a[^]b]c/i

(no 436) succeeded 1 of 1 times:

✅ ADC

/ab|cd/i

(no 437) succeeded 2 of 2 times:

✅ ABC
✅ ABCD

/()ef/i

(no 438) succeeded 1 of 1 times:

✅ DEF

/$b/i

(no 439) succeeded 2 of 2 times:

✅ A]C no match
✅ B no match

/a\(b/i

(no 440) succeeded 1 of 1 times:

✅ A(B

/a\(*b/i

(no 441) succeeded 2 of 2 times:

✅ AB
✅ A((B

/a\\b/i

(no 442) succeeded 2 of 2 times:

✅ A\\b
✅ a\\B

/((a))/i

(no 443) succeeded 1 of 1 times:

✅ ABC

/(a)b(c)/i

(no 444) succeeded 1 of 1 times:

✅ ABC

/a+b+c/i

(no 445) succeeded 1 of 1 times:

✅ AABBABC

/a{1,}b{1,}c/i

(no 446) succeeded 1 of 1 times:

✅ AABBABC

/a.+?c/i

(no 447) succeeded 1 of 1 times:

✅ ABCABC

/a.*?c/i

(no 448) succeeded 1 of 1 times:

✅ ABCABC

/a.{0,5}?c/i

(no 449) succeeded 1 of 1 times:

✅ ABCABC

/(a+|b)*/i

(no 450) succeeded 1 of 1 times:

✅ AB

/(a+|b){0,}/i

(no 451) succeeded 1 of 1 times:

✅ AB

/(a+|b)+/i

(no 452) succeeded 1 of 1 times:

✅ AB

/(a+|b){1,}/i

(no 453) succeeded 1 of 1 times:

✅ AB

/(a+|b)?/i

(no 454) succeeded 1 of 1 times:

✅ AB

/(a+|b){0,1}/i

(no 455) succeeded 1 of 1 times:

✅ AB

/(a+|b){0,1}?/i

(no 456) succeeded 1 of 1 times:

✅ AB

/[^ab]*/i

(no 457) succeeded 1 of 1 times:

✅ CDE

/([abc])*d/i

(no 458) succeeded 1 of 1 times:

✅ ABBBCD

/([abc])*bcd/i

(no 459) succeeded 1 of 1 times:

✅ ABCD

/a|b|c|d|e/i

(no 460) succeeded 1 of 1 times:

✅ E

/(a|b|c|d|e)f/i

(no 461) succeeded 1 of 1 times:

✅ EF

/abcd*efg/i

(no 462) succeeded 1 of 1 times:

✅ ABCDEFG

/ab*/i

(no 463) succeeded 2 of 2 times:

✅ XABYABBBZ
✅ XAYABBBZ

/(ab|cd)e/i

(no 464) succeeded 1 of 1 times:

✅ ABCDE

/[abhgefdc]ij/i

(no 465) succeeded 1 of 1 times:

✅ HIJ

/^(ab|cd)e/i

(no 466) succeeded 1 of 1 times:

✅ ABCDE no match

/(abc|)ef/i

(no 467) succeeded 1 of 1 times:

✅ ABCDEF

/(a|b)c*d/i

(no 468) succeeded 1 of 1 times:

✅ ABCD

/(ab|ab*)bc/i

(no 469) succeeded 1 of 1 times:

✅ ABC

/a([bc]*)c*/i

(no 470) succeeded 1 of 1 times:

✅ ABC

/a([bc]*)(c*d)/i

(no 471) succeeded 1 of 1 times:

✅ ABCD

/a([bc]+)(c*d)/i

(no 472) succeeded 1 of 1 times:

✅ ABCD

/a([bc]*)(c+d)/i

(no 473) succeeded 1 of 1 times:

✅ ABCD

/a[bcd]*dcdcde/i

(no 474) succeeded 1 of 1 times:

✅ ADCDCDE

/a[bcd]+dcdcde/i

(no 475) succeeded 0 of 0 times:

/(ab|a)b*c/i

(no 476) succeeded 1 of 1 times:

✅ ABC

/((a)(b)c)(d)/i

(no 477) succeeded 1 of 1 times:

✅ ABCD

/[a-zA-Z_][a-zA-Z0-9_]*/i

(no 478) succeeded 1 of 1 times:

✅ ALPHA

/^a(bc+|b[eh])g|.h$/i

(no 479) succeeded 1 of 1 times:

✅ ABH

/(bc+d$|ef*g.|h?i(j|k))/i

(no 480) succeeded 6 of 6 times:

✅ EFFGZ
✅ IJ
✅ REFFGZ
✅ ADCDCDE no match
✅ EFFG no match
✅ BCDD no match

/((((((((((a))))))))))/i

(no 481) succeeded 1 of 1 times:

✅ A

/((((((((((a))))))))))\10/i

(no 482) succeeded 1 of 1 times:

✅ AA

/(((((((((a)))))))))/i

(no 483) succeeded 1 of 1 times:

✅ A

/(?:(?:(?:(?:(?:(?:(?:(?:(?:(a))))))))))/i

(no 484) succeeded 1 of 1 times:

✅ A

/(?:(?:(?:(?:(?:(?:(?:(?:(?:(a|b|c))))))))))/i

(no 485) succeeded 1 of 1 times:

✅ C

/multiple words of text/i

(no 486) succeeded 2 of 2 times:

✅ AA no match
✅ UH-UH no match

/multiple words/i

(no 487) succeeded 1 of 1 times:

✅ MULTIPLE WORDS, YEAH

/(.*)c(.*)/i

(no 488) succeeded 1 of 1 times:

✅ ABCDE

/\((.*), (.*)\)/i

(no 489) succeeded 1 of 1 times:

✅ (A, B)

/[k]/i

(no 490) succeeded 0 of 0 times:

/abcd/i

(no 491) succeeded 1 of 1 times:

✅ ABCD

/a(bc)d/i

(no 492) succeeded 1 of 1 times:

✅ ABCD

/a[-]?c/i

(no 493) succeeded 1 of 1 times:

✅ AC

/(abc)\1/i

(no 494) succeeded 1 of 1 times:

✅ ABCABC

/([a-c]*)\1/i

(no 495) succeeded 1 of 1 times:

✅ ABCABC

/a(?!b)./

(no 496) succeeded 1 of 1 times:

✅ abad

/a(?=d)./

(no 497) succeeded 1 of 1 times:

✅ abad

/a(?=c|d)./

(no 498) succeeded 1 of 1 times:

✅ abad

/a(?:b|c|d)(.)/

(no 499) succeeded 1 of 1 times:

✅ ace

/a(?:b|c|d)*(.)/

(no 500) succeeded 1 of 1 times:

✅ ace

/a(?:b|c|d)+?(.)/

(no 501) succeeded 2 of 2 times:

✅ ace
✅ acdbcdbe

/a(?:b|c|d)+(.)/

(no 502) succeeded 1 of 1 times:

✅ acdbcdbe

/a(?:b|c|d){2}(.)/

(no 503) succeeded 1 of 1 times:

✅ acdbcdbe

/a(?:b|c|d){4,5}(.)/

(no 504) succeeded 1 of 1 times:

✅ acdbcdbe

/a(?:b|c|d){4,5}?(.)/

(no 505) succeeded 1 of 1 times:

✅ acdbcdbe

/((foo)|(bar))*/

(no 506) succeeded 1 of 1 times:

✅ foobar

/a(?:b|c|d){6,7}(.)/

(no 507) succeeded 1 of 1 times:

✅ acdbcdbe

/a(?:b|c|d){6,7}?(.)/

(no 508) succeeded 1 of 1 times:

✅ acdbcdbe

/a(?:b|c|d){5,6}(.)/

(no 509) succeeded 1 of 1 times:

✅ acdbcdbe

/a(?:b|c|d){5,6}?(.)/

(no 510) succeeded 1 of 1 times:

✅ acdbcdbe

/a(?:b|c|d){5,7}(.)/

(no 511) succeeded 1 of 1 times:

✅ acdbcdbe

/a(?:b|c|d){5,7}?(.)/

(no 512) succeeded 1 of 1 times:

✅ acdbcdbe

/a(?:b|(c|e){1,2}?|d)+?(.)/

(no 513) succeeded 1 of 1 times:

✅ ace

/^(.+)?B/

(no 514) succeeded 1 of 1 times:

✅ AB

/^([^a-z])|(\^)$/

(no 515) succeeded 1 of 1 times:

✅ .

/^[<>]&/

(no 516) succeeded 1 of 1 times:

✅ <&OUT

/^(a\1?){4}$/

(no 517) succeeded 4 of 4 times:

✅ aaaaaaaaaa
✅ AB no match
✅ aaaaaaaaa no match
✅ aaaaaaaaaaa no match

/^(a(?(1)\1)){4}$/

(no 518) succeeded 3 of 3 times:

✅ aaaaaaaaaa
✅ aaaaaaaaa no match
✅ aaaaaaaaaaa no match

/(?:(f)(o)(o)|(b)(a)(r))*/

(no 519) succeeded 1 of 1 times:

✅ foobar

/(?<=a)b/

(no 520) succeeded 3 of 3 times:

✅ ab
✅ cb no match
✅ b no match

/(?<!c)b/

(no 521) succeeded 3 of 3 times:

✅ ab
✅ b
✅ b

/(?:..)*a/

(no 522) succeeded 1 of 1 times:

✅ aba

/(?:..)*?a/

(no 523) succeeded 1 of 1 times:

✅ aba

/^(){3,5}/

(no 525) succeeded 1 of 1 times:

✅ abc

/^(a+)*ax/

(no 526) succeeded 1 of 1 times:

✅ aax

/(a|x)*ab/

(no 529) succeeded 1 of 1 times:

✅ cab

/(a)*ab/

(no 530) succeeded 1 of 1 times:

✅ cab

/(?:(?i)a)b/

(no 531) succeeded 1 of 1 times:

✅ ab

/((?i)a)b/

(no 532) succeeded 1 of 1 times:

✅ ab

/(?:(?i)a)b/

(no 533) succeeded 1 of 1 times:

✅ Ab

/((?i)a)b/

(no 534) succeeded 1 of 1 times:

✅ Ab

/(?:(?i)a)b/

(no 535) succeeded 2 of 2 times:

✅ cb no match
✅ aB no match

/((?i)a)b/

(no 536) succeeded 0 of 0 times:

/(?i:a)b/

(no 537) succeeded 1 of 1 times:

✅ ab

/((?i:a))b/

(no 538) succeeded 1 of 1 times:

✅ ab

/(?i:a)b/

(no 539) succeeded 1 of 1 times:

✅ Ab

/((?i:a))b/

(no 540) succeeded 1 of 1 times:

✅ Ab

/(?i:a)b/

(no 541) succeeded 2 of 2 times:

✅ aB no match
✅ aB no match

/((?i:a))b/

(no 542) succeeded 0 of 0 times:

/(?:(?-i)a)b/i

(no 543) succeeded 1 of 1 times:

✅ ab

/((?-i)a)b/i

(no 544) succeeded 1 of 1 times:

✅ ab

/(?:(?-i)a)b/i

(no 545) succeeded 1 of 1 times:

✅ aB

/((?-i)a)b/i

(no 546) succeeded 1 of 1 times:

✅ aB

/(?:(?-i)a)b/i

(no 547) succeeded 3 of 3 times:

✅ aB
✅ Ab no match
✅ AB no match

/(?-i:a)b/i

(no 548) succeeded 1 of 1 times:

✅ ab

/((?-i:a))b/i

(no 549) succeeded 1 of 1 times:

✅ ab

/(?-i:a)b/i

(no 550) succeeded 1 of 1 times:

✅ aB

/((?-i:a))b/i

(no 551) succeeded 1 of 1 times:

✅ aB

/(?-i:a)b/i

(no 552) succeeded 2 of 2 times:

✅ AB no match
✅ Ab no match

/((?-i:a))b/i

(no 553) succeeded 0 of 0 times:

/(?-i:a)b/i

(no 554) succeeded 1 of 1 times:

✅ aB

/((?-i:a))b/i

(no 555) succeeded 1 of 1 times:

✅ aB

/(?-i:a)b/i

(no 556) succeeded 2 of 2 times:

✅ Ab no match
✅ AB no match

/((?-i:a))b/i

(no 557) succeeded 0 of 0 times:

/((?-i:a.))b/i

(no 558) succeeded 2 of 2 times:

✅ AB no match
✅ a\nB no match

/((?s-i:a.))b/i

(no 559) succeeded 1 of 1 times:

✅ a\nB

/(?:c|d)(?:)(?:a(?:)(?:b)(?:b(?:))(?:b(?:)(?:b)))/

(no 560) succeeded 1 of 1 times:

✅ cabbbb

/(?:c|d)(?:)(?:aaaaaaaa(?:)(?:bbbbbbbb)(?:bbbbbbbb(?:))(?:bbbbbbbb(?:)(?:bbbbbbbb)))/

(no 561) succeeded 1 of 1 times:

✅ caaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb

/(ab)\d\1/i

(no 562) succeeded 2 of 2 times:

✅ Ab4ab
✅ ab4Ab

/foo\w*\d{4}baz/

(no 563) succeeded 1 of 1 times:

✅ foobar1234baz

/x(~~)*(?:(?:F)?)?/

(no 564) succeeded 1 of 1 times:

✅ x~~

/^a(?#xxx){3}c/

(no 565) succeeded 1 of 1 times:

✅ aaac

/^a (?#xxx) (?#yyy) {3}c/x

(no 566) succeeded 1 of 1 times:

✅ aaac

/(?<![cd])b/

(no 567) succeeded 2 of 2 times:

✅ B\nB no match
✅ dbcb no match

/(?<![cd])[ab]/

(no 568) succeeded 1 of 1 times:

✅ dbaacb

/(?<!(c|d))b/

(no 569) succeeded 0 of 0 times:

/(?<!(c|d))[ab]/

(no 570) succeeded 1 of 1 times:

✅ dbaacb

/(?<!cd)[ab]/

(no 571) succeeded 1 of 1 times:

✅ cdaccb

/^(?:a?b?)*$/

(no 572) succeeded 7 of 7 times:

✅ ``
✅ a
✅ ab
✅ aaa
✅ dbcb no match
✅ a-- no match
✅ aa-- no match

/((?s)^a(.))((?m)^b$)/

(no 573) succeeded 1 of 1 times:

✅ a\nb\nc\n

/((?m)^b$)/

(no 574) succeeded 1 of 1 times:

✅ a\nb\nc\n

/(?m)^b/

(no 575) succeeded 1 of 1 times:

✅ a\nb\n

/(?m)^(b)/

(no 576) succeeded 1 of 1 times:

✅ a\nb\n

/((?m)^b)/

(no 577) succeeded 1 of 1 times:

✅ a\nb\n

/\n((?m)^b)/

(no 578) succeeded 1 of 1 times:

✅ a\nb\n

/((?s).)c(?!.)/

(no 579) succeeded 2 of 2 times:

✅ a\nb\nc\n
✅ a\nb\nc\n

/((?s)b.)c(?!.)/

(no 580) succeeded 2 of 2 times:

✅ a\nb\nc\n
✅ a\nb\nc\n

/^b/

(no 581) succeeded 0 of 0 times:

/()^b/

(no 582) succeeded 2 of 2 times:

✅ a\nb\nc\n no match
✅ a\nb\nc\n no match

/((?m)^b)/

(no 583) succeeded 1 of 1 times:

✅ a\nb\nc\n

/(x)?(?(1)a|b)/

(no 584) succeeded 2 of 2 times:

✅ a no match
✅ a no match

/(x)?(?(1)b|a)/

(no 585) succeeded 1 of 1 times:

✅ a

/()(?(1)b|a)/

(no 587) succeeded 0 of 0 times:

/()?(?(1)a|b)/

(no 588) succeeded 1 of 1 times:

✅ a

/^(\()?blah(?(1)(\)))$/

(no 589) succeeded 5 of 5 times:

✅ (blah)
✅ blah
✅ a no match
✅ blah) no match
✅ (blah no match

/^(\(+)?blah(?(1)(\)))$/

(no 590) succeeded 4 of 4 times:

✅ (blah)
✅ blah
✅ blah) no match
✅ (blah no match

/(?(?!a)a|b)/

(no 591) succeeded 0 of 0 times:

/(?(?!a)b|a)/

(no 592) succeeded 1 of 1 times:

✅ a

/(?(?=a)b|a)/

(no 593) succeeded 2 of 2 times:

✅ a no match
✅ a no match

/(?(?=a)a|b)/

(no 594) succeeded 1 of 1 times:

✅ a

/(?=(a+?))(\1ab)/

(no 595) succeeded 1 of 1 times:

✅ aaab

/^(?=(a+?))\1ab/

(no 596) succeeded 0 of 0 times:

/(\w+:)+/

(no 597) succeeded 1 of 1 times:

✅ one:

/$(?<=^(a))/

(no 598) succeeded 1 of 1 times:

✅ a

/(?=(a+?))(\1ab)/

(no 599) succeeded 1 of 1 times:

✅ aaab

/^(?=(a+?))\1ab/

(no 600) succeeded 2 of 2 times:

✅ aaab no match
✅ aaab no match

/([\w:]+::)?(\w+)$/

(no 601) succeeded 2 of 2 times:

✅ abcd
✅ xy:z:::abcd

/^[^bcd]*(c+)/

(no 602) succeeded 1 of 1 times:

✅ aexycd

/(a*)b+/

(no 603) succeeded 1 of 1 times:

✅ caab

/([\w:]+::)?(\w+)$/

(no 604) succeeded 4 of 4 times:

✅ abcd
✅ xy:z:::abcd
✅ abcd: no match
✅ abcd: no match

/^[^bcd]*(c+)/

(no 605) succeeded 1 of 1 times:

✅ aexycd

/(>a+)ab/

(no 606) succeeded 0 of 0 times:

/(?>a+)b/

(no 607) succeeded 1 of 1 times:

✅ aaab

/([[:]+)/

(no 608) succeeded 1 of 1 times:

✅ a:[b]:

/([[=]+)/

(no 609) succeeded 1 of 1 times:

✅ a=[b]=

/([[.]+)/

(no 610) succeeded 1 of 1 times:

✅ a.[b].

/((?>a+)b)/

(no 611) succeeded 1 of 1 times:

✅ aaab

/(?>(a+))b/

(no 612) succeeded 1 of 1 times:

✅ aaab

/((?>[^()]+)|\([^()]*\))+/

(no 613) succeeded 1 of 1 times:

✅ ((abc(ade)ufh()()x

/a\Z/

(no 614) succeeded 2 of 2 times:

✅ aaab no match
✅ a\nb\n no match

/b\Z/

(no 615) succeeded 1 of 1 times:

✅ a\nb\n

/b\z/

(no 616) succeeded 0 of 0 times:

/b\Z/

(no 617) succeeded 1 of 1 times:

✅ a\nb

/b\z/

(no 618) succeeded 2 of 2 times:

✅ a\nb
✅ ``

/^(?>(?(1)\.|())[^\W_](?>[a-z0-9-]*[^\W_])?)+$/

(no 619) succeeded 22 of 22 times:

✅ a
✅ abc
✅ a-b
✅ 0-9
✅ a.b
✅ 5.6.7
✅ the.quick.brown.fox
✅ a100.b200.300c
✅ 12-ab.1245
✅ `` no match
✅ .a no match
✅ -a no match
✅ a- no match
✅ a. no match
✅ a_b no match
✅ a.- no match
✅ a.. no match
✅ ab..bc no match
✅ the.quick.brown.fox- no match
✅ the.quick.brown.fox. no match
✅ the.quick.brown.fox_ no match
✅ the.quick.brown.fox+ no match

/(?>.*)(?<=(abcd|wxyz))/

(no 620) succeeded 3 of 3 times:

✅ alphabetabcd
✅ endingwxyz
✅ a rather long string that doesn't end with one of them no match

/word (?>(?:(?!otherword)[a-zA-Z0-9]+ ){0,30})otherword/

(no 621) succeeded 3 of 3 times:

✅ word cat dog elephant mussel cow horse canary baboon snake shark otherword
✅ word cat dog elephant mussel cow horse canary baboon snake shark no match
✅ `` no match

/word (?>[a-zA-Z0-9]+ ){0,30}otherword/

(no 622) succeeded 1 of 1 times:

✅ word cat dog elephant mussel cow horse canary baboon snake shark the quick brown fox and the lazy dog and several other words getting close to thirty by now I hope no match

/(?<=\d{3}(?!999))foo/

(no 623) succeeded 3 of 3 times:

✅ 999foo
✅ 123999foo
✅ 123abcfoo no match

/(?<=(?!...999)\d{3})foo/

(no 624) succeeded 3 of 3 times:

✅ 999foo
✅ 123999foo
✅ 123abcfoo no match

/(?<=\d{3}...)(?<!999)foo/

(no 626) succeeded 3 of 3 times:

✅ 123abcfoo
✅ 123456foo
✅ 123999foo no match

/<a[\s]+href[\s]*=[\s]*          # find <a href=
 ([\"\'])?                       # find single or double quote
 (?(1) (.*?)\1 | ([^\s]+))       # if quote found, match up to next matching
                                 # quote, otherwise match up to next space
/isx

(no 627) succeeded 3 of 3 times:

✅ <a href=abcd xyz
✅ <a href=\"abcd xyz pqr\" cats
✅ <a href='abcd xyz pqr' cats

/<a\s+href\s*=\s*                # find <a href=
 (["'])?                         # find single or double quote
 (?(1) (.*?)\1 | (\S+))          # if quote found, match up to next matching
                                 # quote, otherwise match up to next space
/isx

(no 628) succeeded 3 of 3 times:

✅ <a href=abcd xyz
✅ <a href=\"abcd xyz pqr\" cats
✅ <a href = 'abcd xyz pqr' cats

/<a\s+href(?>\s*)=(?>\s*)        # find <a href=
 (["'])?                         # find single or double quote
 (?(1) (.*?)\1 | (\S+))          # if quote found, match up to next matching
                                 # quote, otherwise match up to next space
/isx

(no 629) succeeded 3 of 3 times:

✅ <a href=abcd xyz
✅ <a href=\"abcd xyz pqr\" cats
✅ <a href = 'abcd xyz pqr' cats

/((Z)+|A)*/

(no 630) succeeded 1 of 1 times:

✅ ZABCDEFG

/(Z()|A)*/

(no 631) succeeded 1 of 1 times:

✅ ZABCDEFG

/(Z(())|A)*/

(no 632) succeeded 1 of 1 times:

✅ ZABCDEFG

/((?>Z)+|A)*/

(no 633) succeeded 1 of 1 times:

✅ ZABCDEFG

/((?>)+|A)*/

(no 634) succeeded 1 of 1 times:

✅ ZABCDEFG

/[[:space:]]+/

(no 636) succeeded 2 of 2 times:

✅ > \t\n\f\r\v<
✅ ``

/[[:blank:]]+/

(no 637) succeeded 2 of 2 times:

✅ > \t\n\f\r\v<
✅ ``

/[\s]+/

(no 638) succeeded 2 of 2 times:

✅ > \t\n\f\r\v<
✅ ``

/\s+/

(no 639) succeeded 2 of 2 times:

✅ > \t\n\f\r\v<
✅ ``

/ab/x

(no 640) succeeded 1 of 1 times:

✅ ab

/(?!\A)x/m

(no 641) succeeded 1 of 1 times:

✅ a\nxb\n

/(?!^)x/m

(no 642) succeeded 1 of 1 times:

✅ a\nxb\n no match

/abc\Qabc\Eabc/

(no 643) succeeded 2 of 2 times:

✅ abcabcabc
✅ ``

/abc\Q(*+|\Eabc/

(no 644) succeeded 1 of 1 times:

✅ abc(*+|abc

/   abc\Q abc\Eabc/x

(no 645) succeeded 3 of 3 times:

✅ abc abcabc
✅ abcabcabc no match
✅ `` no match

/abc#comment
    \Q#not comment
    literal\E/x

(no 646) succeeded 1 of 1 times:

✅ abc#not comment\n literal

/abc#comment
    \Q#not comment
    literal/x

(no 647) succeeded 1 of 1 times:

✅ abc#not comment\n literal

/abc#comment
    \Q#not comment
    literal\E #more comment
    /x

(no 648) succeeded 1 of 1 times:

✅ abc#not comment\n literal

/abc#comment
    \Q#not comment
    literal\E #more comment/x

(no 649) succeeded 1 of 1 times:

✅ abc#not comment\n literal

/\Qabc\$xyz\E/

(no 650) succeeded 1 of 1 times:

✅ abc\\$xyz

/\Qabc\E\$\Qxyz\E/

(no 651) succeeded 1 of 1 times:

✅ abc$xyz

/\Gabc/

(no 652) succeeded 2 of 2 times:

✅ abc
✅ xyzabc no match

/a(?x: b c )d/

(no 655) succeeded 2 of 2 times:

✅ XabcdY
✅ Xa b c d Y no match

/((?x)x y z | a b c)/

(no 656) succeeded 2 of 2 times:

✅ XabcY
✅ AxyzB

/(?i)AB(?-i)C/

(no 657) succeeded 2 of 2 times:

✅ XabCY
✅ XabcY no match

/((?i)AB(?-i)C|D)E/

(no 658) succeeded 6 of 6 times:

✅ abCE
✅ DE
✅ abcE no match
✅ abCe no match
✅ dE no match
✅ De no match

/(.*)\d+\1/

(no 659) succeeded 2 of 2 times:

✅ abc123abc
✅ abc123bc

/(.*)\d+\1/s

(no 660) succeeded 3 of 3 times:

✅ abc123abc
✅ abc123bc
✅ ``

/((.*))\d+\1/

(no 661) succeeded 2 of 2 times:

✅ abc123abc
✅ abc123bc

/^(?!:)                       # colon disallowed at start
  (?:                         # start of item
    (?: [0-9a-f]{1,4} |       # 1-4 hex digits or
    (?(1)0 | () ) )           # if null previously matched, fail; else null
    :                         # followed by colon
  ){1,7}                      # end item; 1-7 of them required               
  [0-9a-f]{1,4} $             # final hex number at end of string
  (?(1)|.)                    # check that there was an empty component
  /ix

(no 662) succeeded 14 of 14 times:

✅ a123::a123
✅ a123:b342::abcd
✅ a123:b342::324e:abcd
✅ a123:ddde:b342::324e:abcd
✅ a123:ddde:b342::324e:dcba:abcd
✅ a123:ddde:9999:b342::324e:dcba:abcd
✅ 1:2:3:4:5:6:7:8 no match
✅ a123:bce:ddde:9999:b342::324e:dcba:abcd no match
✅ a123::9999:b342::324e:dcba:abcd no match
✅ abcde:2:3:4:5:6:7:8 no match
✅ ::1 no match
✅ abcd:fee0:123:: no match
✅ :1 no match
✅ 1: no match

/[z\Qa-d]\E]/

(no 663) succeeded 6 of 6 times:

✅ z
✅ a
✅ -
✅ d
✅ ]
✅ b no match

/(?i)reg(?:ul(?:[a\344]|ae)r|ex)/

(no 665) succeeded 4 of 4 times:

✅ REGular
✅ regulaer
✅ Regex
✅ regulär

/\305\346\345\344[\340-\377\300-\337]+/

(no 666) succeeded 4 of 4 times:

✅ Åæåäà
✅ Åæåäÿ
✅ ÅæåäÀ
✅ Åæåäß

/(?<=Z)X./

(no 667) succeeded 1 of 1 times:

✅ \u84XAZXB

/ab cd (?x) de fg/

(no 668) succeeded 1 of 1 times:

✅ ab cd defg

/ab cd(?x) de fg/

(no 669) succeeded 2 of 2 times:

✅ ab cddefg
✅ abcddefg no match

/(?<![^f]oo)(bar)/

(no 670) succeeded 2 of 2 times:

✅ foobarX
✅ boobarX no match

/(?<![^f])X/

(no 671) succeeded 2 of 2 times:

✅ offX
✅ onyX no match

/(?<=[^f])X/

(no 672) succeeded 2 of 2 times:

✅ onyX
✅ offX no match

/(?:(?(1)a|b)(X))+/

(no 675) succeeded 1 of 1 times:

✅ bXaX

/()()()()()()()()()(?:(?(10)\10a|b)(X|Y))+/

(no 677) succeeded 1 of 1 times:

✅ bXXaYYaY

/[[,abc,]+]/

(no 678) succeeded 3 of 3 times:

✅ abc]
✅ a,b]
✅ [a,b,c]

/(?-x: )/x

(no 679) succeeded 2 of 2 times:

✅ A B
✅ ``

/(?x)(?-x: \s*#\s*)/

(no 680) succeeded 2 of 2 times:

✅ A # B
✅ # no match

/(?x-is)(?:(?-ixs) \s*#\s*) include/

(no 681) succeeded 3 of 3 times:

✅ A #include
✅ A#include no match
✅ A #Include no match

/a*b*\w/

(no 682) succeeded 3 of 3 times:

✅ aaabbbb
✅ aaaa
✅ a

/a*b?\w/

(no 683) succeeded 3 of 3 times:

✅ aaabbbb
✅ aaaa
✅ a

/a*b{0,4}\w/

(no 684) succeeded 3 of 3 times:

✅ aaabbbb
✅ aaaa
✅ a

/a*b{0,}\w/

(no 685) succeeded 4 of 4 times:

✅ aaabbbb
✅ aaaa
✅ a
✅ ``

/a*\d*\w/

(no 686) succeeded 3 of 3 times:

✅ 0a
✅ a
✅ ``

/a*b *\w/x

(no 687) succeeded 1 of 1 times:

✅ a

/a*b#comment
  *\w/x

(no 688) succeeded 1 of 1 times:

✅ a

/a* b *\w/x

(no 689) succeeded 1 of 1 times:

✅ a

/^\w+=.*(\\\n.*)*/

(no 690) succeeded 1 of 1 times:

✅ abc=xyz\\\npqr

/(?=(\w+))\1:/

(no 691) succeeded 1 of 1 times:

✅ abcd:

/^(?=(\w+))\1:/

(no 692) succeeded 1 of 1 times:

✅ abcd:

/^[\Eabc]/

(no 694) succeeded 3 of 3 times:

✅ a
✅ E no match
✅ `` no match

/^[a\Q]bc\E]/

(no 698) succeeded 4 of 4 times:

✅ a
✅ ]
✅ c
✅ ``

/^[a-\Q\E]/

(no 699) succeeded 2 of 2 times:

✅ a
✅ -

/^(a()*)*/

(no 700) succeeded 1 of 1 times:

✅ aaaa

/^(?:a(?:(?:))*)*/

(no 701) succeeded 1 of 1 times:

✅ aaaa

/^(a()+)+/

(no 702) succeeded 1 of 1 times:

✅ aaaa

/^(?:a(?:(?:))+)+/

(no 703) succeeded 1 of 1 times:

✅ aaaa

/(a){0,3}(?(1)b|(c|))*D/

(no 704) succeeded 3 of 3 times:

✅ abbD
✅ ccccD
✅ D

/(a|)*\d/

(no 705) succeeded 2 of 2 times:

✅ aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa4
✅ aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa no match

/(?>a|)*\d/

(no 706) succeeded 2 of 2 times:

✅ aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa4
✅ aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa no match

/(?:a|)*\d/

(no 707) succeeded 2 of 2 times:

✅ aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa4
✅ aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa no match

/^(?s)(?>.*)(?<!\n)/

(no 709) succeeded 2 of 2 times:

✅ abc
✅ abc\n no match

/^(?![^\n]*\n\z)/

(no 710) succeeded 2 of 2 times:

✅ abc
✅ abc\n no match

/\z(?<!\n)/

(no 711) succeeded 2 of 2 times:

✅ abc
✅ abc\n no match

/(.*(.)?)*/

(no 712) succeeded 1 of 1 times:

✅ abcd

/( (A | (?(1)0|) )*   )/x

(no 713) succeeded 1 of 1 times:

✅ abcd

/( ( (?(1)0|) )*   )/x

(no 714) succeeded 1 of 1 times:

✅ abcd

/(  (?(1)0|)*   )/x

(no 715) succeeded 1 of 1 times:

✅ abcd

/[[:abcd:xyz]]/

(no 716) succeeded 3 of 3 times:

✅ a]
✅ :]
✅ ``

/[abc[:x\]pqr]/

(no 717) succeeded 5 of 5 times:

✅ a
✅ [
✅ :
✅ ]
✅ p

/.*[op][xyz]/

(no 718) succeeded 1 of 1 times:

✅ fooabcfoo no match

/(?(?=.*b)b|^)/

(no 719) succeeded 2 of 2 times:

✅ adc
✅ abc

/(?(?=^.*b)b|^)/

(no 720) succeeded 2 of 2 times:

✅ adc
✅ abc no match

/(?(?=.*b)b|^)*/

(no 721) succeeded 2 of 2 times:

✅ adc
✅ abc

/(?(?=.*b)b|^)+/

(no 722) succeeded 2 of 2 times:

✅ adc
✅ abc

/(?(?=b).*b|^d)/

(no 723) succeeded 1 of 1 times:

✅ abc

/(?(?=.*b).*b|^d)/

(no 724) succeeded 1 of 1 times:

✅ abc

/^%((?(?=[a])[^%])|b)*%$/

(no 725) succeeded 1 of 1 times:

✅ %ab%

/(?i)a(?-i)b|c/

(no 726) succeeded 4 of 4 times:

✅ XabX
✅ XAbX
✅ CcC
✅ XABX no match

/[\x00-\xff\s]+/

(no 727) succeeded 1 of 1 times:

✅ \n\v\f\r

/(abc)\1/i

(no 728) succeeded 1 of 1 times:

✅ abc no match

/(abc)\1/

(no 729) succeeded 1 of 1 times:

✅ abc no match

/[^a]*/i

(no 730) succeeded 2 of 2 times:

✅ 12abc
✅ 12ABC

/[^a]*+/i

(no 731) succeeded 2 of 2 times:

✅ 12abc
✅ 12ABC

/[^a]*?X/i

(no 732) succeeded 3 of 3 times:

✅ 12abc no match
✅ 12ABC no match
✅ `` no match

/[^a]+?X/i

(no 733) succeeded 2 of 2 times:

✅ 12abc no match
✅ 12ABC no match

/[^a]?X/i

(no 734) succeeded 3 of 3 times:

✅ 12aXbcX
✅ 12AXBCX
✅ BCX

/[^a]??X/i

(no 735) succeeded 4 of 4 times:

✅ 12aXbcX
✅ 12AXBCX
✅ BCX
✅ ``

/[^a]?+X/i

(no 736) succeeded 3 of 3 times:

✅ 12aXbcX
✅ 12AXBCX
✅ BCX

/[^a]{2,3}/i

(no 737) succeeded 2 of 2 times:

✅ abcdef
✅ ABCDEF

/[^a]{2,3}?/i

(no 738) succeeded 2 of 2 times:

✅ abcdef
✅ ABCDEF

/[^a]{2,3}+/i

(no 739) succeeded 2 of 2 times:

✅ abcdef
✅ ABCDEF

/((a|)+)+Z/

(no 740) succeeded 1 of 1 times:

✅ Z

/(a)b|(a)c/

(no 741) succeeded 1 of 1 times:

✅ ac

/(?>(a))b|(a)c/

(no 742) succeeded 1 of 1 times:

✅ ac

/(?=(a))ab|(a)c/

(no 743) succeeded 1 of 1 times:

✅ ac

/((?>(a))b|(a)c)/

(no 744) succeeded 1 of 1 times:

✅ ac

/((?>(a))b|(a)c)++/

(no 745) succeeded 1 of 1 times:

✅ ac

/(?:(?>(a))b|(a)c)++/

(no 746) succeeded 1 of 1 times:

✅ ac

/(?=(?>(a))b|(a)c)(..)/

(no 747) succeeded 1 of 1 times:

✅ ac

/(?>(?>(a))b|(a)c)/

(no 748) succeeded 1 of 1 times:

✅ ac

/((?>(a+)b)+(aabab))/

(no 751) succeeded 1 of 1 times:

✅ aaaabaaabaabab

/(?>a+|ab)+?c/

(no 752) succeeded 1 of 1 times:

✅ aabc no match

/(?>a+|ab)+c/

(no 753) succeeded 1 of 1 times:

✅ aabc no match

/(?:a+|ab)+c/

(no 754) succeeded 1 of 1 times:

✅ aabc

/(?(?=(a))a)/

(no 755) succeeded 1 of 1 times:

✅ a

/(?(?=(a))a)(b)/

(no 756) succeeded 1 of 1 times:

✅ ab

/^(?:a|ab)++c/

(no 757) succeeded 1 of 1 times:

✅ aaaabc no match

/^(?>a|ab)++c/

(no 758) succeeded 1 of 1 times:

✅ aaaabc no match

/^(?:a|ab)+c/

(no 759) succeeded 1 of 1 times:

✅ aaaabc

/(?=abc){0}xyz/

(no 763) succeeded 1 of 1 times:

✅ xyz

/(?=abc){1}xyz/

(no 764) succeeded 2 of 2 times:

✅ xyz no match
✅ `` no match

/(?=(a))?./

(no 765) succeeded 3 of 3 times:

✅ ab
✅ bc
✅ ``

/(?=(a))??./

(no 766) succeeded 2 of 2 times:

✅ ab
✅ bc

/^(?=(?1))?[az]([abc])d/

(no 767) succeeded 2 of 2 times:

✅ abd
✅ zcdxx

/^(?!a){0}\w+/

(no 768) succeeded 1 of 1 times:

✅ aaaaa

/(?<=(abc))?xyz/

(no 769) succeeded 2 of 2 times:

✅ abcxyz
✅ pqrxyz

/^[\g<a>]+/

(no 770) succeeded 3 of 3 times:

✅ ggg<<<aaa>>>
✅ \\ga no match
✅ `` no match

/^[\ga]+/

(no 771) succeeded 2 of 2 times:

✅ gggagagaxyz
✅ ``

/^[:a[:digit:]]+/

(no 772) succeeded 1 of 1 times:

✅ aaaa444:::Z

/^[:a[:digit:]:b]+/

(no 773) succeeded 1 of 1 times:

✅ aaaa444:::bbbZ

/[:a]xxx[b:]/

(no 774) succeeded 2 of 2 times:

✅ :xxx:
✅ ``

/(?<=a{2})b/i

(no 775) succeeded 2 of 2 times:

✅ xaabc
✅ xabc no match

/(?<!a{2})b/i

(no 776) succeeded 2 of 2 times:

✅ xabc
✅ xaabc no match

/(?<=a\h)c/

(no 777) succeeded 2 of 2 times:

✅ xa c
✅ ``

/(?<=[^a]{2})b/

(no 778) succeeded 3 of 3 times:

✅ axxbc
✅ aAAbc
✅ xaabc no match

/(?<=[^a]{2})b/i

(no 779) succeeded 3 of 3 times:

✅ axxbc
✅ aAAbc no match
✅ xaabc no match

/(?<=a\H)c/

(no 780) succeeded 1 of 1 times:

✅ abc

/(?<=a\V)c/

(no 781) succeeded 2 of 2 times:

✅ abc
✅ ``

/(?<=a\v)c/

(no 782) succeeded 1 of 1 times:

✅ a\nc

/(?(?=c)c|d)++Y/

(no 783) succeeded 1 of 1 times:

✅ XcccddYX

/(?(?=c)c|d)*+Y/

(no 784) succeeded 1 of 1 times:

✅ XcccddYX

/^(a{2,3}){2,}+a/

(no 785) succeeded 3 of 3 times:

✅ aaaaaaa
✅ aaaaaa no match
✅ aaaaaaaaa no match

/^(a{2,3})++a/

(no 786) succeeded 1 of 1 times:

✅ aaaaaa no match

/^(a{2,3})*+a/

(no 787) succeeded 1 of 1 times:

✅ aaaaaa no match

/\H\h\V\v/

(no 788) succeeded 4 of 4 times:

✅ X X\n
✅ X\tX\v
✅ X\n no match
✅ `` no match

/\H*\h+\V?\v{3,4}/

(no 789) succeeded 5 of 5 times:

✅ \t X\n\v\f\r\n
✅ \t \n\v\f\r\n
✅ \t \n\v\f
✅ \t \n\v no match
✅ `` no match

/\H{3,4}/

(no 790) succeeded 3 of 3 times:

✅ XY ABCDE
✅ XY PQR ST
✅ ``

/.\h{3,4}./

(no 791) succeeded 1 of 1 times:

✅ XY AB PQRS

/\h*X\h?\H+Y\H?Z/

(no 792) succeeded 4 of 4 times:

✅ >XNNNYZ
✅ > X NYQZ
✅ >XYZ no match
✅ > X NY Z no match

/\v*X\v?Y\v+Z\V*\x0a\V+\x0b\V{2,3}\x0c/

(no 793) succeeded 2 of 2 times:

✅ >XY\nZ\nA\vNN\f
✅ >\n\rX\nY\n\vZZZ\nAAA\vNNN\f

/^(a(b))\1\g1\g{1}\g-1\g{-1}\g{-2}Z/

(no 801) succeeded 1 of 1 times:

✅ ababababbbabZXXXX

/(?<A>tom|bon)-\g{A}/

(no 802) succeeded 3 of 3 times:

✅ tom-tom
✅ bon-bon
✅ ``

/(^(a|b\g{-1}))/

(no 803) succeeded 1 of 1 times:

✅ bacxxx no match

/(?|(abc)|(xyz))\1/

(no 804) succeeded 5 of 5 times:

✅ abcabc
✅ xyzxyz
✅ abcxyz no match
✅ xyzabc no match
✅ `` no match

/(?|(abc)|(xyz))(?1)/

(no 805) succeeded 4 of 4 times:

✅ abcabc
✅ xyzabc
✅ xyzxyz no match
✅ `` no match

/^X(?5)(a)(?|(b)|(q))(c)(d)(Y)/

(no 806) succeeded 1 of 1 times:

✅ XYabcdY

/^X(?7)(a)(?|(b|(r)(s))|(q))(c)(d)(Y)/

(no 807) succeeded 1 of 1 times:

✅ XYabcdY

/^X(?7)(a)(?|(b|(?|(r)|(t))(s))|(q))(c)(d)(Y)/

(no 808) succeeded 1 of 1 times:

✅ XYabcdY

/(?'abc'\w+):\k<abc>{2}/

(no 809) succeeded 4 of 4 times:

✅ a:aaxyz
✅ ab:ababxyz
✅ a:axyz no match
✅ ab:abxyz no match

/(?'abc'\w+):\g{abc}{2}/

(no 810) succeeded 4 of 4 times:

✅ a:aaxyz
✅ ab:ababxyz
✅ a:axyz no match
✅ ab:abxyz no match

/^(?<ab>a)? (?(<ab>)b|c) (?('ab')d|e)/x

(no 811) succeeded 2 of 2 times:

✅ abd
✅ ce

/^(a.)\g-1Z/

(no 812) succeeded 1 of 1 times:

✅ aXaXZ

/^(a.)\g{-1}Z/

(no 813) succeeded 1 of 1 times:

✅ aXaXZ

/^(?(DEFINE) (?<A> a) (?<B> b) )  (?&A) (?&B) /x

(no 814) succeeded 1 of 1 times:

✅ abcd

/(?<NAME>(?&NAME_PAT))\s+(?<ADDR>(?&ADDRESS_PAT))
  (?(DEFINE)
  (?<NAME_PAT>[a-z]+)
  (?<ADDRESS_PAT>\d+)
  )/x

(no 815) succeeded 1 of 1 times:

✅ metcalfe 33

/(?(DEFINE)(?<byte>2[0-4]\d|25[0-5]|1\d\d|[1-9]?\d))\b(?&byte)(\.(?&byte)){3}/

(no 816) succeeded 5 of 5 times:

✅ 1.2.3.4
✅ 131.111.10.206
✅ 10.0.0.0
✅ 10.6 no match
✅ 455.3.4.5 no match

/\b(?&byte)(\.(?&byte)){3}(?(DEFINE)(?<byte>2[0-4]\d|25[0-5]|1\d\d|[1-9]?\d))/

(no 817) succeeded 5 of 5 times:

✅ 1.2.3.4
✅ 131.111.10.206
✅ 10.0.0.0
✅ 10.6 no match
✅ 455.3.4.5 no match

/^(\w++|\s++)*$/

(no 818) succeeded 2 of 2 times:

✅ now is the time for all good men to come to the aid of the party
✅ this is not a line with only words and spaces! no match

/(\d++)(\w)/

(no 819) succeeded 2 of 2 times:

✅ 12345a
✅ 12345+ no match

/a++b/

(no 820) succeeded 1 of 1 times:

✅ aaab

/(a++b)/

(no 821) succeeded 1 of 1 times:

✅ aaab

/(a++)b/

(no 822) succeeded 1 of 1 times:

✅ aaab

/([^()]++|\([^()]*\))+/

(no 823) succeeded 1 of 1 times:

✅ ((abc(ade)ufh()()x

/\(([^()]++|\([^()]+\))+\)/

(no 824) succeeded 3 of 3 times:

✅ (abc)
✅ (abc(def)xyz)
✅ ((()aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa no match

/^([^()]|\((?1)*\))*$/

(no 825) succeeded 4 of 4 times:

✅ abc
✅ a(b)c
✅ a(b(c))d
✅ a(b(c)d no match

/^>abc>([^()]|\((?1)*\))*<xyz<$/

(no 826) succeeded 3 of 3 times:

✅ >abc>123<xyz<
✅ >abc>1(2)3<xyz<
✅ >abc>(1(2)3)<xyz<

/^(?:((.)(?1)\2|)|((.)(?3)\4|.))$/i

(no 827) succeeded 5 of 5 times:

✅ 1221
✅ Satanoscillatemymetallicsonatas
✅ AmanaplanacanalPanama
✅ AblewasIereIsawElba
✅ Thequickbrownfox no match

/^(\d+|\((?1)([+*-])(?1)\)|-(?1))$/

(no 828) succeeded 4 of 4 times:

✅ 12
✅ (((2+2)*-3)-7)
✅ -12
✅ ((2+2)*-3)-7) no match

/^(x(y|(?1){2})z)/

(no 829) succeeded 4 of 4 times:

✅ xyz
✅ xxyzxyzz
✅ xxyzz no match
✅ xxyzxyzxyzz no match

/^a+(*FAIL)/

(no 831) succeeded 2 of 2 times:

✅ aaaaaa no match
✅ `` no match

/a+b?c+(*FAIL)/

(no 832) succeeded 1 of 1 times:

✅ aaabccc no match

/^\W*+(?:((.)\W*+(?1)\W*+\2|)|((.)\W*+(?3)\W*+\4|\W*+.\W*+))\W*+$/i

(no 840) succeeded 5 of 5 times:

✅ 1221
✅ Satan, oscillate my metallic sonatas!
✅ A man, a plan, a canal: Panama!
✅ Able was I ere I saw Elba.
✅ The quick brown fox no match

/^((.)(?1)\2|.)$/

(no 841) succeeded 8 of 8 times:

✅ a
✅ aba
✅ aabaa
✅ abcdcba
✅ pqaabaaqp
✅ ablewasiereisawelba
✅ rhubarb no match
✅ the quick brown fox no match

/(a)(?<=b(?1))/

(no 842) succeeded 3 of 3 times:

✅ baz
✅ caz no match
✅ `` no match

/(?<=b(?1))(a)/

(no 843) succeeded 3 of 3 times:

✅ zbaaz
✅ aaa no match
✅ `` no match

/(?<X>a)(?<=b(?&X))/

(no 844) succeeded 1 of 1 times:

✅ baz

/^(?|(abc)|(def))\1/

(no 845) succeeded 5 of 5 times:

✅ abcabc
✅ defdef
✅ abcdef no match
✅ defabc no match
✅ `` no match

/^(?|(abc)|(def))(?1)/

(no 846) succeeded 4 of 4 times:

✅ abcabc
✅ defabc
✅ defdef no match
✅ abcdef no match

/(?:a(?<quote> (?<apostrophe>')|(?<realquote>")) |b(?<quote> (?<apostrophe>')|(?<realquote>")) ) (?('quote')[a-z]+|[0-9]+)/x,dupnames

(no 847) succeeded 3 of 3 times:

✅ a\"aaaaa
✅ b\"aaaaa
✅ b\"11111 no match

/(?:(?1)|B)(A(*F)|C)/

(no 848) succeeded 3 of 3 times:

✅ ABCD
✅ CCD
✅ CAD no match

/^(?:(?1)|B)(A(*F)|C)/

(no 849) succeeded 5 of 5 times:

✅ CCD
✅ BCD
✅ ABCD no match
✅ CAD no match
✅ BAD no match

/(?(DEFINE)(A))B(?1)C/

(no 851) succeeded 1 of 1 times:

✅ BAC

/(?(DEFINE)((A)\2))B(?1)C/

(no 852) succeeded 1 of 1 times:

✅ BAAC

/(?<pn> \( ( [^()]++ | (?&pn) )* \) )/x

(no 853) succeeded 1 of 1 times:

✅ (ab(cd)ef)

/^([^()]|\((?1)*\))*$/

(no 863) succeeded 2 of 2 times:

✅ a(b)c
✅ a(b(c)d)e

/(?P<L1>(?P<L2>0)(?P>L1)|(?P>L2))/

(no 864) succeeded 3 of 3 times:

✅ 0
✅ 00
✅ 0000

/(?P<L1>(?P<L2>0)|(?P>L2)(?P>L1))/

(no 865) succeeded 3 of 3 times:

✅ 0
✅ 00
✅ 0000

/(?&t)(?#()(?(DEFINE)(?<t>a))/

(no 881) succeeded 1 of 1 times:

✅ bac

/(?i:([^b]))(?1)/

(no 888) succeeded 6 of 6 times:

✅ aa
✅ aA
✅ ab no match
✅ aB no match
✅ Ba no match
✅ ba no match

/^(?&t)*+(?(DEFINE)(?<t>a))\w$/

(no 889) succeeded 2 of 2 times:

✅ aaaaaaX
✅ aaaaaa no match

/^(?&t)*(?(DEFINE)(?<t>a))\w$/

(no 890) succeeded 2 of 2 times:

✅ aaaaaaX
✅ aaaaaa

/^(a)*+(\w)/

(no 891) succeeded 3 of 3 times:

✅ aaaaX
✅ YZ
✅ aaaa no match

/^(?:a)*+(\w)/

(no 892) succeeded 3 of 3 times:

✅ aaaaX
✅ YZ
✅ aaaa no match

/^(a)++(\w)/

(no 893) succeeded 3 of 3 times:

✅ aaaaX
✅ aaaa no match
✅ YZ no match

/^(?:a)++(\w)/

(no 894) succeeded 3 of 3 times:

✅ aaaaX
✅ aaaa no match
✅ YZ no match

/^(a)?+(\w)/

(no 895) succeeded 2 of 2 times:

✅ aaaaX
✅ YZ

/^(?:a)?+(\w)/

(no 896) succeeded 2 of 2 times:

✅ aaaaX
✅ YZ

/^(a){2,}+(\w)/

(no 897) succeeded 3 of 3 times:

✅ aaaaX
✅ aaa no match
✅ YZ no match

/^(?:a){2,}+(\w)/

(no 898) succeeded 3 of 3 times:

✅ aaaaX
✅ aaa no match
✅ YZ no match

/(a|)*(?1)b/

(no 899) succeeded 3 of 3 times:

✅ b
✅ ab
✅ aab

/(a)++(?1)b/

(no 900) succeeded 2 of 2 times:

✅ ab no match
✅ aab no match

/(a)*+(?1)b/

(no 901) succeeded 2 of 2 times:

✅ ab no match
✅ aab no match

/(?1)(?:(b)){0}/

(no 902) succeeded 1 of 1 times:

✅ b

/(foo ( \( ((?:(?> [^()]+ )|(?2))*) \) ) )/x

(no 903) succeeded 1 of 1 times:

✅ foo(bar(baz)+baz(bop))

/\A.*?(a|bc)/

(no 905) succeeded 1 of 1 times:

✅ ba

/\A.*?(?:a|bc)++/

(no 906) succeeded 1 of 1 times:

✅ ba

/\A.*?(a|bc)++/

(no 907) succeeded 1 of 1 times:

✅ ba

/\A.*?(?:a|bc|d)/

(no 908) succeeded 1 of 1 times:

✅ ba

/(?:(b))++/

(no 909) succeeded 1 of 1 times:

✅ beetle

/^(a)(?1)+ab/

(no 911) succeeded 2 of 2 times:

✅ aaaab
✅ ``

/^(a)(?1)++ab/

(no 912) succeeded 1 of 1 times:

✅ aaaab no match

/(?(DEFINE)(a))?b(?1)/

(no 915) succeeded 1 of 1 times:

✅ backgammon

/^\N+/

(no 916) succeeded 2 of 2 times:

✅ abc\ndef
✅ ``

/^\N{1,}/

(no 917) succeeded 1 of 1 times:

✅ abc\ndef

/(?<!a(*FAIL)b)c/

(no 956) succeeded 2 of 2 times:

✅ xcd
✅ acd

/(a)(?2){2}(.)/

(no 961) succeeded 1 of 1 times:

✅ abcd

/(another)?(\1?)test/

(no 986) succeeded 1 of 1 times:

✅ hello world test

/(another)?(\1+)test/

(no 987) succeeded 1 of 1 times:

✅ hello world test no match

/((?:a?)*)*c/

(no 989) succeeded 1 of 1 times:

✅ aac

/((?>a?)*)*c/

(no 990) succeeded 1 of 1 times:

✅ aac

/(?>.*?a)(?<=ba)/

(no 991) succeeded 1 of 1 times:

✅ aba

/(?:.*?a)(?<=ba)/

(no 992) succeeded 1 of 1 times:

✅ aba

/(?>.*?a)b/s

(no 993) succeeded 1 of 1 times:

✅ aab

/(?>.*?a)b/

(no 994) succeeded 1 of 1 times:

✅ aab

/(?>^a)b/s

(no 995) succeeded 1 of 1 times:

✅ aab no match

/(?>.*?)(?<=(abcd)|(wxyz))/

(no 996) succeeded 2 of 2 times:

✅ alphabetabcd
✅ endingwxyz

/(?>.*)(?<=(abcd)|(wxyz))/

(no 997) succeeded 2 of 2 times:

✅ alphabetabcd
✅ endingwxyz

/(?>.*)foo/

(no 998) succeeded 2 of 2 times:

✅ abcdfooxyz no match
✅ `` no match

/(?>.*?)foo/

(no 999) succeeded 1 of 1 times:

✅ abcdfooxyz

/a(?=bc).|abd/

(no 1036) succeeded 3 of 3 times:

✅ abd
✅ abc
✅ ``

/a(?>bc)d|abd/

(no 1038) succeeded 1 of 1 times:

✅ abceabd

/^(a)?(?(1)a|b)+$/

(no 1042) succeeded 1 of 1 times:

✅ a no match

/\A.*?(?:a|bc)/

(no 1080) succeeded 1 of 1 times:

✅ ba

/^\d*\w{4}/

(no 1086) succeeded 2 of 2 times:

✅ 1234
✅ 123 no match

/^[^b]*\w{4}/

(no 1087) succeeded 2 of 2 times:

✅ aaaa
✅ aaa no match

/^[^b]*\w{4}/i

(no 1088) succeeded 2 of 2 times:

✅ aaaa
✅ aaa no match

/^a*\w{4}/

(no 1089) succeeded 2 of 2 times:

✅ aaaa
✅ aaa no match

/^a*\w{4}/i

(no 1090) succeeded 2 of 2 times:

✅ aaaa
✅ aaa no match

/(?:(?<n>foo)|(?<n>bar))\k<n>/dupnames

(no 1091) succeeded 2 of 2 times:

✅ foofoo
✅ barbar

/(?<n>A)(?:(?<n>foo)|(?<n>bar))\k<n>/dupnames

(no 1092) succeeded 4 of 4 times:

✅ AfooA
✅ AbarA
✅ Afoofoo no match
✅ Abarbar no match

/^(\d+)\s+IN\s+SOA\s+(\S+)\s+(\S+)\s*\(\s*$/

(no 1093) succeeded 1 of 1 times:

✅ 1 IN SOA non-sp1 non-sp2(

/^ (?:(?<A>A)|(?'B'B)(?<A>A)) (?('A')x) (?(<B>)y)$/x,dupnames

(no 1094) succeeded 3 of 3 times:

✅ Ax
✅ BAxy
✅ ``

/^A\xZ/

(no 1095) succeeded 1 of 1 times:

✅ A\0Z

/^A\o{123}B/

(no 1096) succeeded 1 of 1 times:

✅ ASB

/ ^ a + + b $ /x

(no 1097) succeeded 2 of 2 times:

✅ aaaab
✅ ``

/ ^ a + #comment
  + b $ /x

(no 1098) succeeded 2 of 2 times:

✅ aaaab
✅ ``

/ ^ a + #comment
  #comment
  + b $ /x

(no 1099) succeeded 2 of 2 times:

✅ aaaab
✅ ``

/ ^ (?> a + ) b $ /x

(no 1100) succeeded 1 of 1 times:

✅ aaaab

/ ^ ( a + ) + + \w $ /x

(no 1101) succeeded 1 of 1 times:

✅ aaaab

/(?:x|(?:(xx|yy)+|x|x|x|x|x)|a|a|a)bc/

(no 1107) succeeded 1 of 1 times:

✅ acb no match

/\A(?:[^\"]++|\"(?:[^\"]*+|\"\")*+\")++/

(no 1108) succeeded 1 of 1 times:

✅ NON QUOTED \"QUOT\"\"ED\" AFTER \"NOT MATCHED

/\A(?:[^\"]++|\"(?:[^\"]++|\"\")*+\")++/

(no 1109) succeeded 1 of 1 times:

✅ NON QUOTED \"QUOT\"\"ED\" AFTER \"NOT MATCHED

/\A(?:[^\"]++|\"(?:[^\"]++|\"\")++\")++/

(no 1110) succeeded 1 of 1 times:

✅ NON QUOTED \"QUOT\"\"ED\" AFTER \"NOT MATCHED

/\A([^\"1]++|[\"2]([^\"3]*+|[\"4][\"5])*+[\"6])++/

(no 1111) succeeded 1 of 1 times:

✅ NON QUOTED \"QUOT\"\"ED\" AFTER \"NOT MATCHED

/^\w+(?>\s*)(?<=\w)/

(no 1112) succeeded 1 of 1 times:

✅ test test

/(?P<Name>a)?(?P<Name2>b)?(?(<Name>)c|d)*l/

(no 1118) succeeded 4 of 4 times:

✅ acl
✅ bdl
✅ adl
✅ bcl

/\sabc/

(no 1119) succeeded 1 of 1 times:

✅ \vabc

/[\Qa]\E]+/

(no 1120) succeeded 1 of 1 times:

✅ aa]]

/[\Q]a\E]+/

(no 1121) succeeded 1 of 1 times:

✅ aa]]

/A((((((((a))))))))\8B/

(no 1122) succeeded 1 of 1 times:

✅ AaaB

/A(((((((((a)))))))))\9B/

(no 1123) succeeded 2 of 2 times:

✅ AaaB
✅ ``

/A[\8\9]B/

(no 1124) succeeded 2 of 2 times:

✅ A8B
✅ A9B

/(|ab)*?d/

(no 1125) succeeded 2 of 2 times:

✅ abd
✅ xyd

/(\2|a)(\1)/

(no 1127) succeeded 1 of 1 times:

✅ aaa

/(\2)(\1)/

(no 1128) succeeded 0 of 0 times:

/Z*(|d*){216}/

(no 1129) succeeded 0 of 0 times:

/(?1)(?#?'){8}(a)/

(no 1130) succeeded 1 of 1 times:

✅ baaaaaaaaac

/((((((((((((x))))))))))))\12/

(no 1131) succeeded 1 of 1 times:

✅ xx

/A[\8]B[\9]C/

(no 1132) succeeded 1 of 1 times:

✅ A8B9C

/(?1)()((((((\1++))\x85)+)|))/

(no 1133) succeeded 1 of 1 times:

✅ \u85\u85

/(?|(\k'Pm')|(?'Pm'))/

(no 1134) succeeded 1 of 1 times:

✅ abcd

/(?|(aaa)|(b))\g{1}/

(no 1135) succeeded 2 of 2 times:

✅ aaaaaa
✅ bb

/(?|(aaa)|(b))(?1)/

(no 1136) succeeded 3 of 3 times:

✅ aaaaaa
✅ baaa
✅ bb no match

/(?|(aaa)|(b))/

(no 1137) succeeded 2 of 2 times:

✅ xaaa
✅ xbc

/(?|(?'a'aaa)|(?'a'b))\k'a'/

(no 1138) succeeded 2 of 2 times:

✅ aaaaaa
✅ bb

/(?|(?'a'aaa)|(?'a'b))(?'a'cccc)\k'a'/dupnames

(no 1139) succeeded 2 of 2 times:

✅ aaaccccaaa
✅ bccccb

/(?<=a(B){0}c)X/

(no 1141) succeeded 1 of 1 times:

✅ acX

/(?<DEFINE>b)(?(DEFINE)(a+))(?&DEFINE)/

(no 1142) succeeded 2 of 2 times:

✅ bbbb
✅ baaab no match

/(?=.*[A-Z])(?=.*[a-z])(?=.*[0-9])(?=.*[,;:])(?=.{8,16})(?!.*[\s])/

(no 1143) succeeded 1 of 1 times:

✅ Fred:099

/(?=.*X)X$/

(no 1144) succeeded 1 of 1 times:

✅ X

/(?s)(?=.*?)b/

(no 1145) succeeded 1 of 1 times:

✅ aabc

/(Z)(a)\2{1,2}?(?-i)\1X/i

(no 1146) succeeded 1 of 1 times:

✅ ZaAAZX

/(?'c')XX(?'YYYYYYYYYYYYYYYYYYYYYYYCl')/

(no 1147) succeeded 0 of 0 times:

/[s[:digit:]\E-H]+/

(no 1148) succeeded 1 of 1 times:

✅ s09-H

/[s[:digit:]\Q\E-H]+/

(no 1149) succeeded 1 of 1 times:

✅ s09-H

/a+(?:|b)a/

(no 1150) succeeded 1 of 1 times:

✅ aaaa

/X?(R||){3335}/

(no 1151) succeeded 0 of 0 times:

/(?(DEFINE)(?<m> 1? (?=(?<cond>2)?) 1 2 (?('cond')|3)))
    \A
    ()
    (?&m)
    \Z/x

(no 1153) succeeded 1 of 1 times:

✅ 123

/^(?: 
(?: A| (1? (?=(?<cond>2)?) (1) 2 (?('cond')|3)) )
(Z)
)+$/x

(no 1154) succeeded 3 of 3 times:

✅ AZ123Z
✅ AZ12Z no match
✅ `` no match

/^ (?(DEFINE) ( (?!(a)\2b)..) )   ()(?1)  /x

(no 1155) succeeded 3 of 3 times:

✅ acb
✅ aab no match
✅ `` no match

/(?>ab|abab){1,5}?M/

(no 1156) succeeded 1 of 1 times:

✅ abababababababababababM

/(?>ab|abab){2}?M/

(no 1157) succeeded 1 of 1 times:

✅ abababM

/((?(?=(a))a)+k)/

(no 1158) succeeded 1 of 1 times:

✅ bbak

/((?(?=(a))a|)+k)/

(no 1159) succeeded 1 of 1 times:

✅ bbak

/(?(?!(b))a|b)+k/

(no 1160) succeeded 1 of 1 times:

✅ ababbalbbadabak

/(?!(b))c|b/

(no 1161) succeeded 2 of 2 times:

✅ Ab
✅ Ac

/(?=(b))b|c/

(no 1162) succeeded 2 of 2 times:

✅ Ab
✅ Ac

/^(.|(.)(?1)\2)$/

(no 1163) succeeded 5 of 5 times:

✅ a
✅ aba
✅ abcba
✅ ababa
✅ abcdcba

/^((.)(?1)\2|.?)$/

(no 1164) succeeded 8 of 8 times:

✅ a
✅ aba
✅ abba
✅ abcba
✅ ababa
✅ abccba
✅ abcdcba
✅ abcddcba

/^(.)(\1|a(?2))/

(no 1165) succeeded 1 of 1 times:

✅ bab

/^(.|(.)(?1)?\2)$/

(no 1166) succeeded 2 of 2 times:

✅ abcba
✅ ``

/^(?(?=(a))abc|def)/

(no 1167) succeeded 1 of 1 times:

✅ abc

/^(?(?!(a))def|abc)/

(no 1168) succeeded 1 of 1 times:

✅ abc

/^(?1)\d{3}(a)/

(no 1171) succeeded 1 of 1 times:

✅ a123a

/(?ix)(?(DEFINE)
(?<addr_spec>       (?&local_part) \@ (?&domain) )
(?<angle_addr>      (?&CFWS)?+ < (?&addr_spec) > (?&CFWS)?+ )
(?<atext>           [a-z\d!#\$%&'*+-\x{2f}=?^_`{|}~] )
(?<atom>            (?&CFWS)?+ (?&atext)+ (?&CFWS)?+ )
(?<ccontent>        (?&ctext) | (?&quoted_pair) | (?&comment) )
(?<ctext>           [^\x{9}\x{10}\x{13}\x{7f}-\x{ff}\ ()\\] )
(?<comment>         \( (?: (?&FWS)?+ (?&ccontent) )*+ (?&FWS)?+ \) )
(?<CFWS>            (?: (?&FWS)?+ (?&comment) )* (?# NOT possessive)
                    (?: (?&FWS)?+ (?&comment) | (?&FWS) ) )
(?<dcontent>        (?&dtext) | (?&quoted_pair) )
(?<display_name>    (?&phrase) )
(?<domain>          (?&dot_atom) | (?&domain_literal) )
(?<domain_literal>  (?&CFWS)?+ \[ (?: (?&FWS)?+ (?&dcontent) )* (?&FWS)?+ \]
                    (?&CFWS)?+ )
(?<dot_atom>        (?&CFWS)?+ (?&dot_atom_text) (?&CFWS)?+ )
(?<dot_atom_text>   (?&atext)++ (?: \. (?&atext)++)*+ )
(?<dtext>           [^\x{9}\x{10}\x{13}\x{7f}-\x{ff}\ \[\]\\] )
(?<FWS>             (?: [\t\ ]*+ \n)?+ [\t\ ]++ )
(?<local_part>      (?&dot_atom) | (?&quoted_string)  )
(?<mailbox>         (?&name_addr) | (?&addr_spec) )
(?<name_addr>       (?&display_name)? (?&angle_addr) )
(?<phrase>          (?&word)++ )
(?<qcontent>        (?&qtext) | (?&quoted_pair) )
(?<quoted_pair>     " (?&text) )
(?<quoted_string>   (?&CFWS)?+ " (?: (?&FWS)?+ (?&qcontent))* (?&FWS)?+ "
                    (?&CFWS)?+ )
(?<qtext>           [^\x{9}\x{10}\x{13}\x{7f}-\x{ff}\ "\\] )
(?<text>            [^\r\n] )
(?<word>            (?&atom) | (?&quoted_string) )
) # End DEFINE
^(?&mailbox)$/

(no 1172) succeeded 12 of 12 times:

✅ Alan Other <user@dom.ain>
✅ <user@dom.ain>
✅ user@dom.ain
✅ user@[]
✅ user@[domain literal]
✅ user@[domain literal with \"[square brackets\"] inside]
✅ \"A. Other\" <user.1234@dom.ain> (a comment)
✅ A. Other <user.1234@dom.ain> (a comment)
✅ \"/s=user/ou=host/o=place/prmd=uu.yy/admd= /c=gb/\"@x400-re.lay
✅ A missing angle <user@some.where no match
✅ The quick brown fox no match
✅ `` no match

/<(?x:[a b])>/xx

(no 1174) succeeded 1 of 1 times:

✅ < >

/<(?:[a b])>/xx

(no 1175) succeeded 1 of 1 times:

✅ < > no match

/<(?xxx:[a b])>/

(no 1176) succeeded 2 of 2 times:

✅ < > no match
✅ `` no match

/<(?-x:[a b])>/xx

(no 1177) succeeded 1 of 1 times:

✅ < >

/[[:digit:]-]+/

(no 1178) succeeded 1 of 1 times:

✅ 12-24

/(?(DEFINE)(?<optional_a>a?)X)^(?&optional_a)a$/

(no 1182) succeeded 2 of 2 times:

✅ aa
✅ a

/^(a?)b(?1)a/

(no 1183) succeeded 4 of 4 times:

✅ abaa
✅ aba
✅ baa
✅ ba

/^(a?)+b(?1)a/

(no 1184) succeeded 4 of 4 times:

✅ abaa
✅ aba
✅ baa
✅ ba

/^(a?)++b(?1)a/

(no 1185) succeeded 4 of 4 times:

✅ abaa
✅ aba
✅ baa
✅ ba

/^(a?)+b/

(no 1186) succeeded 3 of 3 times:

✅ b
✅ ab
✅ aaab

/(?=a+)a(a+)++b/

(no 1187) succeeded 1 of 1 times:

✅ aab

/(?<=(?=.)?)/

(no 1189) succeeded 0 of 0 times:

/(?<=(?=.)?+)/

(no 1190) succeeded 0 of 0 times:

/(?<=(?=.)*)/

(no 1191) succeeded 0 of 0 times:

/(?<=(?=.){4,5})/

(no 1192) succeeded 0 of 0 times:

/(?<=(?=.){4,5}x)/

(no 1193) succeeded 0 of 0 times:

/a(*F:X)b/

(no 1202) succeeded 2 of 2 times:

✅ abc no match
✅ `` no match

/(?(DEFINE)(a(*F:X)))(?1)b/

(no 1203) succeeded 1 of 1 times:

✅ abc no match

/(?i)A(?^)B(?^x:C D)(?^i)e f/

(no 1212) succeeded 3 of 3 times:

✅ aBCDE F
✅ aBCDEF no match
✅ AbCDe f no match

/(*pla:foo).{6}/

(no 1213) succeeded 2 of 2 times:

✅ abcfoobarxyz
✅ abcfooba no match

/(*positive_lookahead:foo).{6}/

(no 1214) succeeded 2 of 2 times:

✅ abcfoobarxyz
✅ ``

/(?(*pla:foo).{6}|a..)/

(no 1215) succeeded 2 of 2 times:

✅ foobarbaz
✅ abcfoobar

/(?(*positive_lookahead:foo).{6}|a..)/

(no 1216) succeeded 3 of 3 times:

✅ foobarbaz
✅ abcfoobar
✅ ``

/(*plb:foo)bar/

(no 1217) succeeded 2 of 2 times:

✅ abcfoobar
✅ abcbarfoo no match

/(*positive_lookbehind:foo)bar/

(no 1218) succeeded 3 of 3 times:

✅ abcfoobar
✅ abcbarfoo no match
✅ `` no match

/(?(*plb:foo)bar|baz)/

(no 1219) succeeded 5 of 5 times:

✅ abcfoobar
✅ bazfoobar
✅ abcbazfoobar
✅ foobazfoobar
✅ ``

/(?(*positive_lookbehind:foo)bar|baz)/

(no 1220) succeeded 5 of 5 times:

✅ abcfoobar
✅ bazfoobar
✅ abcbazfoobar
✅ foobazfoobar
✅ ``

/(*nlb:foo)bar/

(no 1221) succeeded 2 of 2 times:

✅ abcbarfoo
✅ abcfoobar no match

/(*negative_lookbehind:foo)bar/

(no 1222) succeeded 3 of 3 times:

✅ abcbarfoo
✅ abcfoobar no match
✅ `` no match

/(?(*nlb:foo)bar|baz)/

(no 1223) succeeded 4 of 4 times:

✅ abcfoobaz
✅ abcbarbaz
✅ abcfoobar no match
✅ `` no match

/(?(*negative_lookbehind:foo)bar|baz)/

(no 1224) succeeded 4 of 4 times:

✅ abcfoobaz
✅ abcbarbaz
✅ abcfoobar no match
✅ `` no match

/(*atomic:a+)\w/

(no 1225) succeeded 2 of 2 times:

✅ aaab
✅ aaaa no match

/   (?<word> \w+ )*    \.   /xi

(no 1226) succeeded 2 of 2 times:

✅ pokus.
✅ ``

/(?(DEFINE) (?<word> \w+ ) ) (?&word)*   \./xi

(no 1227) succeeded 1 of 1 times:

✅ pokus.

/(?(DEFINE) (?<word> \w+ ) ) ( (?&word)* )   \./xi

(no 1228) succeeded 1 of 1 times:

✅ pokus.

/(?&word)*  (?(DEFINE) (?<word> \w+ ) )  \./xi

(no 1229) succeeded 1 of 1 times:

✅ pokus.

/(?&word)*  \. (?<word> \w+ )/xi

(no 1230) succeeded 1 of 1 times:

✅ pokus.hokus

/(?:a|ab){1}+c/

(no 1233) succeeded 1 of 1 times:

✅ abc no match

/(a|ab){1}+c/

(no 1234) succeeded 2 of 2 times:

✅ abc no match
✅ `` no match

/(a+){1}+a/

(no 1235) succeeded 1 of 1 times:

✅ aaaa no match

/(?(DEFINE)(a|ab))(?1){1}+c/

(no 1236) succeeded 1 of 1 times:

✅ abc no match

/(?:a|(?=b)|.)*\z/

(no 1237) succeeded 2 of 2 times:

✅ abc
✅ ``

/(?:a|(?=b)|.)*/

(no 1238) succeeded 2 of 2 times:

✅ abc
✅ ``

/(?<=(?=(?<=a)))b/

(no 1242) succeeded 1 of 1 times:

✅ ab

/^(?<A>a)(?(<A>)b)((?<=b).*)$/

(no 1243) succeeded 1 of 1 times:

✅ abc

/^(a\1?){4}$/

(no 1244) succeeded 2 of 2 times:

✅ aaaa
✅ aaaaaa

/^((\1+)|\d)+133X$/

(no 1245) succeeded 1 of 1 times:

✅ 111133X

/^(?>.*?([A-Z])(?!.*\1)){26}/i

(no 1247) succeeded 6 of 6 times:

✅ The quick brown fox jumps over the lazy dog.
✅ Jackdaws love my big sphinx of quartz.
✅ Pack my box with five dozen liquor jugs.
✅ The quick brown fox jumps over the lazy cat. no match
✅ Hackdaws love my big sphinx of quartz. no match
✅ Pack my fox with five dozen liquor jugs. no match

/(?<=X(?(DEFINE)(A)))X(*F)/

(no 1248) succeeded 1 of 1 times:

✅ AXYZ no match

/(?<=X(?(DEFINE)(A)))./

(no 1249) succeeded 1 of 1 times:

✅ AXYZ

/(?<=X(?(DEFINE)(.*))Y)./

(no 1250) succeeded 1 of 1 times:

✅ AXYZ

/(?<=X(?(DEFINE)(Y))(?1))./

(no 1251) succeeded 1 of 1 times:

✅ AXYZ

/(?(DEFINE)(?<foo>bar))(?<![-a-z0-9])word/

(no 1252) succeeded 1 of 1 times:

✅ word