a[b-d] aac y $& ac
a[-b] a- y $& a-
a[b-] a- y $& a-
-a[b-a] - c - Invalid [] range "b-a" before HERE mark in regex m/a[b-a << HERE ]/
-a[]b - c - Unmatched [ before HERE mark in regex m/a[ << HERE ]b/
-a[ - c - Unmatched [ before HERE mark in regex m/a[ << HERE /
+a[b-a] - c - Invalid [] range "b-a"
+a[]b - c - Unmatched [
+a[ - c - Unmatched [
a] a] y $& a]
a[]]b a]b y $& a]b
a[^bc]d aed y $& aed
ab|cd abc y $& ab
ab|cd abcd y $& ab
()ef def y $&-$1 ef-
-*a - c - Quantifier follows nothing before HERE mark in regex m/* << HERE a/
-(*)b - c - Quantifier follows nothing before HERE mark in regex m/(* << HERE )b/
+*a - c - Quantifier follows nothing
+(*)b - c - Quantifier follows nothing
$b b n - -
a\ - c - Search pattern not terminated
a\(b a(b y $&-$1 a(b-
a\(*b ab y $& ab
a\(*b a((b y $& a((b
a\\b a\b y $& a\b
-abc) - c - Unmatched ) before HERE mark in regex m/abc) << HERE /
-(abc - c - Unmatched ( before HERE mark in regex m/( << HERE abc/
+abc) - c - Unmatched )
+(abc - c - Unmatched (
((a)) abc y $&-$1-$2 a-a-a
(a)b(c) abc y $&-$1-$2 abc-a-c
a+b+c aabbabc y $& abc
a{1,}b{1,}c aabbabc y $& abc
-a** - c - Nested quantifiers before HERE mark in regex m/a** << HERE /
+a** - c - Nested quantifiers
a.+?c abcabc y $& abc
(a+|b)* ab y $&-$1 ab-b
(a+|b){0,} ab y $&-$1 ab-b
(a+|b){1,} ab y $&-$1 ab-b
(a+|b)? ab y $&-$1 a-a
(a+|b){0,1} ab y $&-$1 a-a
-)( - c - Unmatched ) before HERE mark in regex m/) << HERE (/
+)( - c - Unmatched )
[^ab]* cde y $& cde
abc n - -
a* y $&
'a[b-d]'i AAC y $& AC
'a[-b]'i A- y $& A-
'a[b-]'i A- y $& A-
-'a[b-a]'i - c - Invalid [] range "b-a" before HERE mark in regex m/a[b-a << HERE ]/
-'a[]b'i - c - Unmatched [ before HERE mark in regex m/a[ << HERE ]b/
-'a['i - c - Unmatched [ before HERE mark in regex m/a[ << HERE /
+'a[b-a]'i - c - Invalid [] range "b-a"
+'a[]b'i - c - Unmatched [
+'a['i - c - Unmatched [
'a]'i A] y $& A]
'a[]]b'i A]B y $& A]B
'a[^bc]d'i AED y $& AED
'ab|cd'i ABC y $& AB
'ab|cd'i ABCD y $& AB
'()ef'i DEF y $&-$1 EF-
-'*a'i - c - Quantifier follows nothing before HERE mark in regex m/* << HERE a/
-'(*)b'i - c - Quantifier follows nothing before HERE mark in regex m/(* << HERE )b/
+'*a'i - c - Quantifier follows nothing
+'(*)b'i - c - Quantifier follows nothing
'$b'i B n - -
'a\'i - c - Search pattern not terminated
'a\(b'i A(B y $&-$1 A(B-
'a\(*b'i AB y $& AB
'a\(*b'i A((B y $& A((B
'a\\b'i A\B y $& A\B
-'abc)'i - c - Unmatched ) before HERE mark in regex m/abc) << HERE /
-'(abc'i - c - Unmatched ( before HERE mark in regex m/( << HERE abc/
+'abc)'i - c - Unmatched )
+'(abc'i - c - Unmatched (
'((a))'i ABC y $&-$1-$2 A-A-A
'(a)b(c)'i ABC y $&-$1-$2 ABC-A-C
'a+b+c'i AABBABC y $& ABC
'a{1,}b{1,}c'i AABBABC y $& ABC
-'a**'i - c - Nested quantifiers before HERE mark in regex m/a** << HERE /
+'a**'i - c - Nested quantifiers
'a.+?c'i ABCABC y $& ABC
'a.*?c'i ABCABC y $& ABC
'a.{0,5}?c'i ABCABC y $& ABC
'(a+|b)?'i AB y $&-$1 A-A
'(a+|b){0,1}'i AB y $&-$1 A-A
'(a+|b){0,1}?'i AB y $&-$1 -
-')('i - c - Unmatched ) before HERE mark in regex m/) << HERE (/
+')('i - c - Unmatched )
'[^ab]*'i CDE y $& CDE
'abc'i n - -
'a*'i y $&
(?<!c)b cb n - -
(?<!c)b b y - -
(?<!c)b b y $& b
-(?<%)b - c - Sequence (?<%...) not recognized before HERE mark in regex m/(?<% << HERE )b/
+(?<%)b - c - Sequence (?<%...) not recognized
(?:..)*a aba y $& aba
(?:..)*?a aba y $& a
^(?:b|a(?=(.)))*\1 abc y $& 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 - Sequence (?{...}) not terminated or not {}-balanced
+a(?{{})b - c - Sequence (?{...}) not terminated or not {}-balanced
a(?{}})b - c -
-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
a(?{"\{"})b cabd y $& ab
a(?{"{"}})b - c - Unmatched right curly bracket
a(?{$bl="\{"}).b caxbd y $bl {
^(\(+)?blah(?(1)(\)))$ 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) a c - Switch condition not recognized
(?(1)a|b|c) a c - Switch (?(condition)... contains too many branches
(?(?{0})a|b) a n - -
(?(?{0})b|a) a y $& a
([[:]+) 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[:xyz: - c - Unmatched [
+[a[:xyz:] - c - POSIX class [:xyz:] unknown
[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[:xyz:]b]+) pbaq c - POSIX class [:xyz:] unknown
[a[:]b[:c] abc y $& abc
([[:alpha:]]+) ABcd01Xy__-- ${nulnul}${ffff} y $1 ABcd
([[:alnum:]]+) 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 ]/
+[[:foo:]] - c - POSIX class [:foo:] unknown
+[[:^foo:]] - c - POSIX class [:^foo:] unknown
((?>a+)b) aaab y $1 aaab
(?>(a+))b aaab y $1 aaa
((?>[^()]+)|\([^()]*\))+ ((abc(ade)ufh()()x y $& abc(ade)ufh()()x
a\Z b\na y $-[0] 2
a\z b\na y $-[0] 2
a$ b\na y $-[0] 2
-'a\Z'm a\nb\n bn - -
+'a\Z'm a\nb\n n - -
'a\z'm a\nb\n n - -
'a$'m a\nb\n y $-[0] 0
'a\Z'm b\na\n y $-[0] 2
aa\Z b\naa y $-[0] 2
aa\z b\naa y $-[0] 2
aa$ b\naa y $-[0] 2
-'aa\Z'm aa\nb\n bn - -
+'aa\Z'm aa\nb\n n - -
'aa\z'm aa\nb\n n - -
'aa$'m aa\nb\n y $-[0] 0
'aa\Z'm b\naa\n y $-[0] 2
ab\Z b\nab y $-[0] 2
ab\z b\nab y $-[0] 2
ab$ b\nab y $-[0] 2
-'ab\Z'm ab\nb\n bn - -
+'ab\Z'm ab\nb\n n - -
'ab\z'm ab\nb\n n - -
'ab$'m ab\nb\n y $-[0] 0
'ab\Z'm b\nab\n y $-[0] 2
abb\Z b\nabb y $-[0] 2
abb\z b\nabb y $-[0] 2
abb$ b\nabb y $-[0] 2
-'abb\Z'm abb\nb\n bn - -
+'abb\Z'm abb\nb\n n - -
'abb\z'm abb\nb\n n - -
'abb$'m abb\nb\n y $-[0] 0
'abb\Z'm b\nabb\n y $-[0] 2
(ab)?(ab)+ ab y $1:$2 :ab -
(abc)?(abc)+ abc y $1:$2 :abc -
'b\s^'m a\nb\n n - -
+\ba a y - -
+^(a(??{"(?!)"})|(a)(?{1}))b ab y $2 a # [ID 20010811.006]
+ab(?i)cd AbCd n - - # [ID 20010809.023]
+ab(?i)cd abCd y - -
+(A|B)*(?(1)(CD)|(CD)) CD y $2-$3 -CD
+(A|B)*(?(1)(CD)|(CD)) ABCD y $2-$3 CD-
+(A|B)*?(?(1)(CD)|(CD)) CD y $2-$3 -CD # [ID 20010803.016]
+(A|B)*?(?(1)(CD)|(CD)) ABCD y $2-$3 CD-
+'^(o)(?!.*\1)'i Oo n - -
+(.*)\d+\1 abc12bc y $1 bc
+(?m:(foo\s*$)) foo\n bar y $1 foo
+(.*)c abcd y $1 ab
+(.*)(?=c) abcd y $1 ab
+(.*)(?=c)c abcd yB $1 ab
+(.*)(?=b|c) abcd y $1 ab
+(.*)(?=b|c)c abcd y $1 ab
+(.*)(?=c|b) abcd y $1 ab
+(.*)(?=c|b)c abcd y $1 ab
+(.*)(?=[bc]) abcd y $1 ab
+(.*)(?=[bc])c abcd yB $1 ab
+(.*)(?<=b) abcd y $1 ab
+(.*)(?<=b)c abcd y $1 ab
+(.*)(?<=b|c) abcd y $1 abc
+(.*)(?<=b|c)c abcd y $1 ab
+(.*)(?<=c|b) abcd y $1 abc
+(.*)(?<=c|b)c abcd y $1 ab
+(.*)(?<=[bc]) abcd y $1 abc
+(.*)(?<=[bc])c abcd y $1 ab
+(.*?)c abcd y $1 ab
+(.*?)(?=c) abcd y $1 ab
+(.*?)(?=c)c abcd yB $1 ab
+(.*?)(?=b|c) abcd y $1 a
+(.*?)(?=b|c)c abcd y $1 ab
+(.*?)(?=c|b) abcd y $1 a
+(.*?)(?=c|b)c abcd y $1 ab
+(.*?)(?=[bc]) abcd y $1 a
+(.*?)(?=[bc])c abcd yB $1 ab
+(.*?)(?<=b) abcd y $1 ab
+(.*?)(?<=b)c abcd y $1 ab
+(.*?)(?<=b|c) abcd y $1 ab
+(.*?)(?<=b|c)c abcd y $1 ab
+(.*?)(?<=c|b) abcd y $1 ab
+(.*?)(?<=c|b)c abcd y $1 ab
+(.*?)(?<=[bc]) abcd y $1 ab
+(.*?)(?<=[bc])c abcd y $1 ab