a[b-d] aac y $& ac
a[-b] a- y $& a-
a[b-] a- y $& a-
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+a[b-a] - c - /a[b-a]/: invalid [] range "b-a" in regexp
a[]b - c - /a[]b/: unmatched [] in regexp
a[ - c - /a[/: unmatched [] in regexp
a] a] y $& a]
(bc+d$|ef*g.|h?i(j|k)) reffgz y $&-$1-$2 effgz-effgz-
((((((((((a)))))))))) a y $10 a
((((((((((a))))))))))\10 aa y $& aa
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-((((((((((a))))))))))\41 a! y $& a!
+((((((((((a))))))))))${bang} aa n - -
+((((((((((a))))))))))${bang} a! y $& a!
(((((((((a))))))))) a y $& a
multiple words of text uh-uh n - -
multiple words multiple words, yeah y $& multiple words
a[-]?c ac y $& ac
(abc)\1 abcabc y $1 abc
([a-c]*)\1 abcabc y $1 abc
+\1 - c - /\1/: reference to nonexistent group
+\2 - c - /\2/: reference to nonexistent group
+(a)|\1 a y - -
+(a)|\1 x n - -
+(a)|\2 - c - /(a)|\2/: reference to nonexistent group
+(([a-c])b*?\2)* ababbbcbc y $&-$1-$2 ababb-bb-b
+(([a-c])b*?\2){3} ababbbcbc y $&-$1-$2 ababbbcbc-cbc-c
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'abc'i ABC y $& ABC
'abc'i XBC n - -
'abc'i AXC n - -
'a[b-d]'i AAC y $& AC
'a[-b]'i A- y $& A-
'a[b-]'i A- y $& A-
-'a[b-a]'i - c - /a[b-a]/: invalid [] range in regexp
+'a[b-a]'i - c - /a[b-a]/: invalid [] range "b-a" in regexp
'a[]b'i - c - /a[]b/: unmatched [] in regexp
'a['i - c - /a[/: unmatched [] in regexp
'a]'i A] y $& A]
'(bc+d$|ef*g.|h?i(j|k))'i REFFGZ y $&-$1-$2 EFFGZ-EFFGZ-
'((((((((((a))))))))))'i A y $10 A
'((((((((((a))))))))))\10'i AA y $& AA
-'((((((((((a))))))))))\41'i AA n - -
-'((((((((((a))))))))))\41'i A! y $& A!
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+'((((((((((a))))))))))${bang}'i A! y $& A!
'(((((((((a)))))))))'i A y $& A
'(?:(?:(?:(?:(?:(?:(?:(?:(?:(a))))))))))'i A y $1 A
'(?:(?:(?:(?:(?:(?:(?:(?:(?:(a|b|c))))))))))'i C y $1 C
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^(a\1?){4}$ aaaaaaaaa n - -
^(a\1?){4}$ aaaaaaaaaaa n - -
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-^(a\1){4}$ aaaaaaaaa n - -
-^(a\1){4}$ aaaaaaaaaaa n - -
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(?:(f)(o)(o)|(b)(a)(r))* foobar y $1:$2:$3:$4:$5:$6 f:o:o:b:a:r
(?<=a)b ab y $& b
(?<=a)b cb n - -
((?i)a)b Ab y $&:$1 Ab:A
(?:(?i)a)b aB n - -
((?i)a)b aB n - -
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+'((?-i)a)b'i Ab n - -
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+'((?-i)a)b'i aB y $1 a
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+'((?-i:a))b'i aB y $&:$1 aB:a
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+'((?-i:a))b'i aB y $1 a
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+'((?-i:a))b'i AB n - -
+'((?-i:a.))b'i a\nB n - -
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+'((?s-i:a.))b'i B\nB n - -
(?:c|d)(?:)(?:a(?:)(?:b)(?:b(?:))(?:b(?:)(?:b))) cabbbb y $& cabbbb
(?:c|d)(?:)(?:aaaaaaaa(?:)(?:bbbbbbbb)(?:bbbbbbbb(?:))(?:bbbbbbbb(?:)(?:bbbbbbbb))) caaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb y $& caaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
'(ab)\d\1'i Ab4ab y $1 Ab
'(ab)\d\1'i ab4Ab y $1 ab
foo\w*\d{4}baz foobar1234baz y $& foobar1234baz
-a{1,32766} aaa y $& aaa
-a{1,32767} - c - /a{1,32767}/: Quantifier in {,} bigger than
-a{1,32768} - c - /a{1,32768}/: Quantifier in {,} bigger than
a(?{})b cabd y $& ab
a(?{)b - c - /a(?{)b/: Sequence (?{...}) not terminated or not {}-balanced
a(?{{})b - c - /a(?{{})b/: Sequence (?{...}) not terminated or not {}-balanced
a(?{}})b - c - /a(?{}})b/: Sequence (?{...}) not terminated or not {}-balanced
a(?{"{"})b - c - /a(?{"{"})b/: Sequence (?{...}) not terminated or not {}-balanced
a(?{"\{"})b cabd y $& ab
-a(?{"{"}})b - c - Unmatched right bracket
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a(?{$bl="\{"}).b caxbd y $bl {
x(~~)*(?:(?:F)?)? x~~ y - -
^a(?#xxx){3}c aaac y $& aaac
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(>a+)ab aaab n - -
(?>a+)b aaab y - -
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+([[:^ascii:]]+) ABcd01Xy__-- ${nulnul}${ffff} y $1 ${ffff}
+([[:^cntrl:]]+) ABcd01Xy__-- ${nulnul}${ffff} y $1 ABcd01Xy__--
+([[:^digit:]]+) ABcd01Xy__-- ${nulnul}${ffff} y $1 ABcd
+([[:^lower:]]+) ABcd01Xy__-- ${nulnul}${ffff} y $1 AB
+([[:^print:]]+) ABcd01Xy__-- ${nulnul}${ffff} y $1 ${nulnul}${ffff}
+([[:^punct:]]+) ABcd01Xy__-- ${nulnul}${ffff} y $1 ABcd01Xy
+([[:^space:]]+) ABcd01Xy__-- ${nulnul}${ffff} y $1 ABcd01Xy__--
+([[:^word:]]+) ABcd01Xy__-- ${nulnul}${ffff} y $1 -- ${nulnul}${ffff}
+([[:^upper:]]+) ABcd01Xy__-- ${nulnul}${ffff} y $1 cd01
+([[:^xdigit:]]+) ABcd01Xy__-- ${nulnul}${ffff} y $1 Xy__-- ${nulnul}${ffff}
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+[[:^foo:]] - c - Character class [:^foo:] unknown
((?>a+)b) aaab y $1 aaab
(?>(a+))b aaab y $1 aaa
((?>[^()]+)|\([^()]*\))+ ((abc(ade)ufh()()x y $& abc(ade)ufh()()x
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+'abb\z'm b\nca n - -
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+'((?-x:.) )'x x y $1- x-
+foo.bart foo.bart y - -
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