re_tests

UNIX下perl实现代码

(?: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(?{})b	cabd	y	$&	ab
a(?{)b	-	c	-	Sequence (?{...}) not terminated or not {}-balanced before HERE mark in regex m/a(?{ << HERE )b/
a(?{{})b	-	c	-	Sequence (?{...}) not terminated or not {}-balanced before HERE mark in regex m/a(?{ << HERE {})b/
a(?{}})b	-	c	-	
a(?{"{"})b	-	c	-	Sequence (?{...}) not terminated or not {}-balanced before HERE mark in regex m/a(?{ << HERE "{"})b/
a(?{"\{"})b	cabd	y	$&	ab
a(?{"{"}})b	-	c	-	Unmatched right curly bracket
a(?{$bl="\{"}).b	caxbd	y	$bl	{
x(~~)*(?:(?:F)?)?	x~~	y	-	-
^a(?#xxx){3}c	aaac	y	$&	aaac
'^a (?#xxx) (?#yyy) {3}c'x	aaac	y	$&	aaac
(?<![cd])b	dbcb	n	-	-
(?<![cd])[ab]	dbaacb	y	$&	a
(?<!(c|d))b	dbcb	n	-	-
(?<!(c|d))[ab]	dbaacb	y	$&	a
(?<!cd)[ab]	cdaccb	y	$&	b
^(?:a?b?)*$	a--	n	-	-
((?s)^a(.))((?m)^b$)	a\nb\nc\n	y	$1;$2;$3	a\n;\n;b
((?m)^b$)	a\nb\nc\n	y	$1	b
(?m)^b	a\nb\n	y	$&	b
(?m)^(b)	a\nb\n	y	$1	b
((?m)^b)	a\nb\n	y	$1	b
\n((?m)^b)	a\nb\n	y	$1	b
((?s).)c(?!.)	a\nb\nc\n	y	$1	\n
((?s).)c(?!.)	a\nb\nc\n	y	$1:$&	\n:\nc
((?s)b.)c(?!.)	a\nb\nc\n	y	$1	b\n
((?s)b.)c(?!.)	a\nb\nc\n	y	$1:$&	b\n:b\nc
^b	a\nb\nc\n	n	-	-
()^b	a\nb\nc\n	n	-	-
((?m)^b)	a\nb\nc\n	y	$1	b
(?(1)a|b)	a	n	-	-
(?(1)b|a)	a	y	$&	a
(x)?(?(1)a|b)	a	n	-	-
(x)?(?(1)b|a)	a	y	$&	a
()?(?(1)b|a)	a	y	$&	a
()(?(1)b|a)	a	n	-	-
()?(?(1)a|b)	a	y	$&	a
^(\()?blah(?(1)(\)))$	(blah)	y	$2	)
^(\()?blah(?(1)(\)))$	blah	y	($2)	()
^(\()?blah(?(1)(\)))$	blah)	n	-	-
^(\()?blah(?(1)(\)))$	(blah	n	-	-
^(\(+)?blah(?(1)(\)))$	(blah)	y	$2	)
^(\(+)?blah(?(1)(\)))$	blah	y	($2)	()
^(\(+)?blah(?(1)(\)))$	blah)	n	-	-
^(\(+)?blah(?(1)(\)))$	(blah	n	-	-
(?(1?)a|b)	a	c	-	Switch condition not recognized before HERE mark in regex m/(?(1? << HERE )a|b)/
(?(1)a|b|c)	a	c	-	Switch (?(condition)... contains too many branches
(?(?{0})a|b)	a	n	-	-
(?(?{0})b|a)	a	y	$&	a
(?(?{1})b|a)	a	n	-	-
(?(?{1})a|b)	a	y	$&	a
(?(?!a)a|b)	a	n	-	-
(?(?!a)b|a)	a	y	$&	a
(?(?=a)b|a)	a	n	-	-
(?(?=a)a|b)	a	y	$&	a
(?=(a+?))(\1ab)	aaab	y	$2	aab
^(?=(a+?))\1ab	aaab	n	-	-
(\w+:)+	one:	y	$1	one:
$(?<=^(a))	a	y	$1	a
(?=(a+?))(\1ab)	aaab	y	$2	aab
^(?=(a+?))\1ab	aaab	n	-	-
([\w:]+::)?(\w+)$	abcd:	n	-	-
([\w:]+::)?(\w+)$	abcd	y	$1-$2	-abcd
([\w:]+::)?(\w+)$	xy:z:::abcd	y	$1-$2	xy:z:::-abcd
^[^bcd]*(c+)	aexycd	y	$1	c
(a*)b+	caab	y	$1	aa
([\w:]+::)?(\w+)$	abcd:	n	-	-
([\w:]+::)?(\w+)$	abcd	y	$1-$2	-abcd
([\w:]+::)?(\w+)$	xy:z:::abcd	y	$1-$2	xy:z:::-abcd
^[^bcd]*(c+)	aexycd	y	$1	c
(?{$a=2})a*aa(?{local$a=$a+1})k*c(?{$b=$a})	yaaxxaaaacd	y	$b	3
(?{$a=2})(a(?{local$a=$a+1}))*aak*c(?{$b=$a})	yaaxxaaaacd	y	$b	4
(>a+)ab	aaab	n	-	-
(?>a+)b	aaab	y	-	-
([[:]+)	a:[b]:	y	$1	:[
([[=]+)	a=[b]=	y	$1	=[
([[.]+)	a.[b].	y	$1	.[
[a[:xyz:	-	c	-	Unmatched [ before HERE mark in regex m/[ << HERE a[:xyz:/
[a[:xyz:]	-	c	-	POSIX class [:xyz:] unknown before HERE mark in regex m/[a[:xyz:] << HERE /
[a[:]b[:c]	abc	y	$&	abc
([a[:xyz:]b]+)	pbaq	c	-	POSIX class [:xyz:] unknown before HERE mark in regex m/([a[:xyz:] << HERE b]+)/
[a[:]b[:c]	abc	y	$&	abc
([[:alpha:]]+)	ABcd01Xy__--  ${nulnul}${ffff}	y	$1	ABcd
([[:alnum:]]+)	ABcd01Xy__--  ${nulnul}${ffff}	y	$1	ABcd01Xy
([[:ascii:]]+)	ABcd01Xy__--  ${nulnul}${ffff}	y	$1	ABcd01Xy__--  ${nulnul}
([[:cntrl:]]+)	ABcd01Xy__--  ${nulnul}${ffff}	y	$1	${nulnul}
([[:digit:]]+)	ABcd01Xy__--  ${nulnul}${ffff}	y	$1	01
([[:graph:]]+)	ABcd01Xy__--  ${nulnul}${ffff}	y	$1	ABcd01Xy__--
([[:lower:]]+)	ABcd01Xy__--  ${nulnul}${ffff}	y	$1	cd
([[:print:]]+)	ABcd01Xy__--  ${nulnul}${ffff}	y	$1	ABcd01Xy__--  
([[:punct:]]+)	ABcd01Xy__--  ${nulnul}${ffff}	y	$1	__--
([[:space:]]+)	ABcd01Xy__--  ${nulnul}${ffff}	y	$1	  
([[:word:]]+)	ABcd01Xy__--  ${nulnul}${ffff}	y	$1	ABcd01Xy__
([[:upper:]]+)	ABcd01Xy__--  ${nulnul}${ffff}	y	$1	AB
([[:xdigit:]]+)	ABcd01Xy__--  ${nulnul}${ffff}	y	$1	ABcd01
([[:^alpha:]]+)	ABcd01Xy__--  ${nulnul}${ffff}	y	$1	01
([[:^alnum:]]+)	ABcd01Xy__--  ${nulnul}${ffff}	y	$1	__--  ${nulnul}${ffff}
([[:^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}
[[:foo:]]	-	c	-	POSIX class [:foo:] unknown before HERE mark in regex m/[[:foo:] << HERE ]/
[[:^foo:]]	-	c	-	POSIX class [:^foo:] unknown before HERE mark in regex m/[[:^foo:] << HERE ]/
((?>a+)b)	aaab	y	$1	aaab
(?>(a+))b	aaab	y	$1	aaa
((?>[^()]+)|\([^()]*\))+	((abc(ade)ufh()()x	y	$&	abc(ade)ufh()()x
(?<=x+)y	-	c	-	Variable length lookbehind not implemented
a{37,17}	-	c	-	Can't do {n,m} with n > m
\Z	a\nb\n	y	$-[0]	3
\z	a\nb\n	y	$-[0]	4
$	a\nb\n	y	$-[0]	3
\Z	b\na\n	y	$-[0]	3
\z	b\na\n	y	$-[0]	4
$	b\na\n	y	$-[0]	3
\Z	b\na	y	$-[0]	3
\z	b\na	y	$-[0]	3
$	b\na	y	$-[0]	3
'\Z'm	a\nb\n	y	$-[0]	3
'\z'm	a\nb\n	y	$-[0]	4
'$'m	a\nb\n	y	$-[0]	1
'\Z'm	b\na\n	y	$-[0]	3
'\z'm	b\na\n	y	$-[0]	4
'$'m	b\na\n	y	$-[0]	1
'\Z'm	b\na	y	$-[0]	3
'\z'm	b\na	y	$-[0]	3
'$'m	b\na	y	$-[0]	1
a\Z	a\nb\n	n	-	-
a\z	a\nb\n	n	-	-
a$	a\nb\n	n	-	-
a\Z	b\na\n	y	$-[0]	2
a\z	b\na\n	n	-	-
a$	b\na\n	y	$-[0]	2
a\Z	b\na	y	$-[0]	2
a\z	b\na	y	$-[0]	2
a$	b\na	y	$-[0]	2
'a\Z'm	a\nb\n	bn	-	-
'a\z'm	a\nb\n	n	-	-
'a$'m	a\nb\n	y	$-[0]	0
'a\Z'm	b\na\n	y	$-[0]	2
'a\z'm	b\na\n	n	-	-
'a$'m	b\na\n	y	$-[0]	2
'a\Z'm	b\na	y	$-[0]	2
'a\z'm	b\na	y	$-[0]	2
'a$'m	b\na	y	$-[0]	2
aa\Z	aa\nb\n	n	-	-
aa\z	aa\nb\n	n	-	-
aa$	aa\nb\n	n	-	-
aa\Z	b\naa\n	y	$-[0]	2
aa\z	b\naa\n	n	-	-
aa$	b\naa\n	y	$-[0]	2
aa\Z	b\naa	y	$-[0]	2
aa\z	b\naa	y	$-[0]	2
aa$	b\naa	y	$-[0]	2
'aa\Z'm	aa\nb\n	bn	-	-
'aa\z'm	aa\nb\n	n	-	-
'aa$'m	aa\nb\n	y	$-[0]	0
'aa\Z'm	b\naa\n	y	$-[0]	2
'aa\z'm	b\naa\n	n	-	-
'aa$'m	b\naa\n	y	$-[0]	2
'aa\Z'm	b\naa	y	$-[0]	2
'aa\z'm	b\naa	y	$-[0]	2
'aa$'m	b\naa	y	$-[0]	2
aa\Z	ac\nb\n	n	-	-
aa\z	ac\nb\n	n	-	-
aa$	ac\nb\n	n	-	-
aa\Z	b\nac\n	n	-	-
aa\z	b\nac\n	n	-	-
aa$	b\nac\n	n	-	-
aa\Z	b\nac	n	-	-
aa\z	b\nac	n	-	-
aa$	b\nac	n	-	-
'aa\Z'm	ac\nb\n	n	-	-
'aa\z'm	ac\nb\n	n	-	-
'aa$'m	ac\nb\n	n	-	-
'aa\Z'm	b\nac\n	n	-	-
'aa\z'm	b\nac\n	n	-	-
'aa$'m	b\nac\n	n	-	-
'aa\Z'm	b\nac	n	-	-
'aa\z'm	b\nac	n	-	-
'aa$'m	b\nac	n	-	-
aa\Z	ca\nb\n	n	-	-
aa\z	ca\nb\n	n	-	-
aa$	ca\nb\n	n	-	-
aa\Z	b\nca\n	n	-	-
aa\z	b\nca\n	n	-	-
aa$	b\nca\n	n	-	-
aa\Z	b\nca	n	-	-
aa\z	b\nca	n	-	-
aa$	b\nca	n	-	-
'aa\Z'm	ca\nb\n	n	-	-
'aa\z'm	ca\nb\n	n	-	-
'aa$'m	ca\nb\n	n	-	-
'aa\Z'm	b\nca\n	n	-	-
'aa\z'm	b\nca\n	n	-	-
'aa$'m	b\nca\n	n	-	-
'aa\Z'm	b\nca	n	-	-
'aa\z'm	b\nca	n	-	-
'aa$'m	b\nca	n	-	-
ab\Z	ab\nb\n	n	-	-
ab\z	ab\nb\n	n	-	-
ab$	ab\nb\n	n	-	-
ab\Z	b\nab\n	y	$-[0]	2
ab\z	b\nab\n	n	-	-
ab$	b\nab\n	y	$-[0]	2
ab\Z	b\nab	y	$-[0]	2
ab\z	b\nab	y	$-[0]	2
ab$	b\nab	y	$-[0]	2
'ab\Z'm	ab\nb\n	bn	-	-
'ab\z'm	ab\nb\n	n	-	-
'ab$'m	ab\nb\n	y	$-[0]	0
'ab\Z'm	b\nab\n	y	$-[0]	2
'ab\z'm	b\nab\n	n	-	-
'ab$'m	b\nab\n	y	$-[0]	2
'ab\Z'm	b\nab	y	$-[0]	2
'ab\z'm	b\nab	y	$-[0]	2
'ab$'m	b\nab	y	$-[0]	2
ab\Z	ac\nb\n	n	-	-
ab\z	ac\nb\n	n	-	-
ab$	ac\nb\n	n	-	-
ab\Z	b\nac\n	n	-	-
ab\z	b\nac\n	n	-	-
ab$	b\nac\n	n	-	-
ab\Z	b\nac	n	-	-
ab\z	b\nac	n	-	-
ab$	b\nac	n	-	-
'ab\Z'm	ac\nb\n	n	-	-
'ab\z'm	ac\nb\n	n	-	-
'ab$'m	ac\nb\n	n	-	-
'ab\Z'm	b\nac\n	n	-	-
'ab\z'm	b\nac\n	n	-	-
'ab$'m	b\nac\n	n	-	-
'ab\Z'm	b\nac	n	-	-
'ab\z'm	b\nac	n	-	-
'ab$'m	b\nac	n	-	-
ab\Z	ca\nb\n	n	-	-
ab\z	ca\nb\n	n	-	-
ab$	ca\nb\n	n	-	-
ab\Z	b\nca\n	n	-	-
ab\z	b\nca\n	n	-	-
ab$	b\nca\n	n	-	-
ab\Z	b\nca	n	-	-
ab\z	b\nca	n	-	-
ab$	b\nca	n	-	-
'ab\Z'm	ca\nb\n	n	-	-
'ab\z'm	ca\nb\n	n	-	-
'ab$'m	ca\nb\n	n	-	-
'ab\Z'm	b\nca\n	n	-	-
'ab\z'm	b\nca\n	n	-	-
'ab$'m	b\nca\n	n	-	-
'ab\Z'm	b\nca	n	-	-
'ab\z'm	b\nca	n	-	-
'ab$'m	b\nca	n	-	-
abb\Z	abb\nb\n	n	-	-
abb\z	abb\nb\n	n	-	-
abb$	abb\nb\n	n	-	-
abb\Z	b\nabb\n	y	$-[0]	2
abb\z	b\nabb\n	n	-	-
abb$	b\nabb\n	y	$-[0]	2
abb\Z	b\nabb	y	$-[0]	2
abb\z	b\nabb	y	$-[0]	2
abb$	b\nabb	y	$-[0]	2
'abb\Z'm	abb\nb\n	bn	-	-
'abb\z'm	abb\nb\n	n	-	-
'abb$'m	abb\nb\n	y	$-[0]	0
'abb\Z'm	b\nabb\n	y	$-[0]	2
'abb\z'm	b\nabb\n	n	-	-
'abb$'m	b\nabb\n	y	$-[0]	2
'abb\Z'm	b\nabb	y	$-[0]	2
'abb\z'm	b\nabb	y	$-[0]	2
'abb$'m	b\nabb	y	$-[0]	2
abb\Z	ac\nb\n	n	-	-
abb\z	ac\nb\n	n	-	-
abb$	ac\nb\n	n	-	-
abb\Z	b\nac\n	n	-	-
abb\z	b\nac\n	n	-	-
abb$	b\nac\n	n	-	-
abb\Z	b\nac	n	-	-
abb\z	b\nac	n	-	-
abb$	b\nac	n	-	-
'abb\Z'm	ac\nb\n	n	-	-
'abb\z'm	ac\nb\n	n	-	-
'abb$'m	ac\nb\n	n	-	-
'abb\Z'm	b\nac\n	n	-	-
'abb\z'm	b\nac\n	n	-	-
'abb$'m	b\nac\n	n	-	-
'abb\Z'm	b\nac	n	-	-
'abb\z'm	b\nac	n	-	-
'abb$'m	b\nac	n	-	-
abb\Z	ca\nb\n	n	-	-
abb\z	ca\nb\n	n	-	-
abb$	ca\nb\n	n	-	-
abb\Z	b\nca\n	n	-	-
abb\z	b\nca\n	n	-	-
abb$	b\nca\n	n	-	-
abb\Z	b\nca	n	-	-
abb\z	b\nca	n	-	-
abb$	b\nca	n	-	-
'abb\Z'm	ca\nb\n	n	-	-
'abb\z'm	ca\nb\n	n	-	-
'abb$'m	ca\nb\n	n	-	-
'abb\Z'm	b\nca\n	n	-	-
'abb\z'm	b\nca\n	n	-	-
'abb$'m	b\nca\n	n	-	-
'abb\Z'm	b\nca	n	-	-
'abb\z'm	b\nca	n	-	-
'abb$'m	b\nca	n	-	-
(^|x)(c)	ca	y	$2	c
a*abc?xyz+pqr{3}ab{2,}xy{4,5}pq{0,6}AB{0,}zz	x	n	-	-
a(?{$a=2;$b=3;($b)=$a})b	yabz	y	$b	2
round\(((?>[^()]+))\)	_I(round(xs * sz),1)	y	$1	xs * sz
'((?x:.) )'	x 	y	$1-	x -
'((?-x:.) )'x	x 	y	$1-	x-
foo.bart	foo.bart	y	-	-
'^d[x][x][x]'m	abcd\ndxxx	y	-	-
.X(.+)+X	bbbbXcXaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa	y	-	-
.X(.+)+XX	bbbbXcXXaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa	y	-	-
.XX(.+)+X	bbbbXXcXaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa	y	-	-
.X(.+)+X	bbbbXXaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa	n	-	-
.X(.+)+XX	bbbbXXXaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa	n	-	-
.XX(.+)+X	bbbbXXXaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa	n	-	-
.X(.+)+[X]	bbbbXcXaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa	y	-	-
.X(.+)+[X][X]	bbbbXcXXaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa	y	-	-
.XX(.+)+[X]	bbbbXXcXaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa	y	-	-
.X(.+)+[X]	bbbbXXaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa	n	-	-
.X(.+)+[X][X]	bbbbXXXaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa	n	-	-
.XX(.+)+[X]	bbbbXXXaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa	n	-	-
.[X](.+)+[X]	bbbbXcXaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa	y	-	-
.[X](.+)+[X][X]	bbbbXcXXaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa	y	-	-
.[X][X](.+)+[X]	bbbbXXcXaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa	y	-	-
.[X](.+)+[X]	bbbbXXaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa	n	-	-
.[X](.+)+[X][X]	bbbbXXXaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa	n	-	-
.[X][X](.+)+[X]	bbbbXXXaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa	n	-	-
tt+$	xxxtt	y	-	-
([a-\d]+)	za-9z	y	$1	a-9
([\d-z]+)	a0-za	y	$1	0-z
([\d-\s]+)	a0- z	y	$1	0- 
([a-[:digit:]]+)	za-9z	y	$1	a-9
([[:digit:]-z]+)	=0-z=	y	$1	0-z
([[:digit:]-[:alpha:]]+)	=0-z=	y	$1	0-z
\GX.*X	aaaXbX	n	-	-
(\d+\.\d+)	3.1415926	y	$1	3.1415926
(\ba.{0,10}br)	have a web browser	y	$1	a web br
'\.c(pp|xx|c)?$'i	Changes	n	-	-
'\.c(pp|xx|c)?$'i	IO.c	y	-	-
'(\.c(pp|xx|c)?$)'i	IO.c	y	$1	.c
^([a-z]:)	C:/	n	-	-
'^\S\s+aa$'m	\nx aa	y	-	-
(^|a)b	ab	y	-	-
^([ab]*?)(b)?(c)$	abac	y	-$2-	--
(\w)?(abc)\1b	abcab	n	-	-
^(?:.,){2}c	a,b,c	y	-	-
^(.,){2}c	a,b,c	y	$1	b,
^(?:[^,]*,){2}c	a,b,c	y	-	-
^([^,]*,){2}c	a,b,c	y	$1	b,
^([^,]*,){3}d	aaa,b,c,d	y	$1	c,
^([^,]*,){3,}d	aaa,b,c,d	y	$1	c,
^([^,]*,){0,3}d	aaa,b,c,d	y	$1	c,
^([^,]{1,3},){3}d	aaa,b,c,d	y	$1	c,
^([^,]{1,3},){3,}d	aaa,b,c,d	y	$1	c,
^([^,]{1,3},){0,3}d	aaa,b,c,d	y	$1	c,
^([^,]{1,},){3}d	aaa,b,c,d	y	$1	c,
^([^,]{1,},){3,}d	aaa,b,c,d	y	$1	c,
^([^,]{1,},){0,3}d	aaa,b,c,d	y	$1	c,
^([^,]{0,3},){3}d	aaa,b,c,d	y	$1	c,
^([^,]{0,3},){3,}d	aaa,b,c,d	y	$1	c,
^([^,]{0,3},){0,3}d	aaa,b,c,d	y	$1	c,
(?i)		y	-	-
'(?!\A)x'm	a\nxb\n	y	-	-
^(a(b)?)+$	aba	y	-$1-$2-	-a--
^(aa(bb)?)+$	aabbaa	y	-$1-$2-	-aa--
'^.{9}abc.*\n'm	123\nabcabcabcabc\n	y	-	-
^(a)?a$	a	y	-$1-	--
^(a)?(?(1)a|b)+$	a	n	-	-
^(a\1?)(a\1?)(a\2?)(a\3?)$	aaaaaa	y	$1,$2,$3,$4	a,aa,a,aa
^(a\1?){4}$	aaaaaa	y	$1	aa
^(0+)?(?:x(1))?	x1	y	-	-
^([0-9a-fA-F]+)(?:x([0-9a-fA-F]+)?)(?:x([0-9a-fA-F]+))?	012cxx0190	y	-	-
^(b+?|a){1,2}c	bbbac	y	$1	a
^(b+?|a){1,2}c	bbbbac	y	$1	a
\((\w\. \w+)\)	cd. (A. Tw)	y	-$1-	-A. Tw-
((?:aaaa|bbbb)cccc)?	aaaacccc	y	-	-
((?:aaaa|bbbb)cccc)?	bbbbcccc	y	-	-