a[b-d] aac y $& ac
a[-b] a- y $& a-
a[b-] a- y $& a-
-a[b-a] - c - /a[b-a]/: invalid [] range in regexp
-a[]b - c - /a[]b/: unmatched [] in regexp
-a[ - c - /a[/: unmatched [] in regexp
+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/ at (eval 96) line 1, <TESTS> line 49.
+a[ - c - Unmatched [ before HERE mark in regex m/a[ << HERE / at (eval 97) line 1, <TESTS> line 50.
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 - /*a/: ?+*{} follows nothing in regexp
-(*)b - c - /(*)b/: ?+*{} follows nothing in regexp
+*a - c - Quantifier follows nothing before HERE mark in regex m/* << HERE a/ at (eval 192) line 1, <TESTS> line 98.
+(*)b - c - Quantifier follows nothing before HERE mark in regex m/(* << HERE )b/ at (eval 193) line 1, <TESTS> line 99.
$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 - /abc)/: unmatched () in regexp
-(abc - c - /(abc/: unmatched () in regexp
+abc) - c - Unmatched ) before HERE mark in regex m/abc) << HERE / at (eval 205) line 1, <TESTS> line 106.
+(abc - c - Unmatched ( before HERE mark in regex m/( << HERE abc/ at (eval 206) line 1, <TESTS> line 107.
((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 - /a**/: nested *?+ in regexp
+a** - c - Nested quantifiers before HERE mark in regex m/a** << HERE / at (eval 215) line 1, <TESTS> line 112.
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 () in regexp
+)( - c - Unmatched ) before HERE mark in regex m/) << HERE (/ at (eval 230) line 1, <TESTS> line 120.
[^ab]* cde y $& cde
abc n - -
a* y $&
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
+\1 - c - Reference to nonexistent group
+\2 - c - Reference to nonexistent group
(a)|\1 a y - -
(a)|\1 x n - -
-(a)|\2 - c - /(a)|\2/: reference to nonexistent group
+(a)|\2 - c - 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
((\3|b)\2(a)x)+ aaxabxbaxbbx 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'i - c - /a[]b/: unmatched [] in regexp
-'a['i - c - /a[/: unmatched [] in regexp
+'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/ at (eval 431) line 1, <TESTS> line 222.
+'a['i - c - Unmatched [ before HERE mark in regex m/a[ << HERE / at (eval 432) line 1, <TESTS> line 223.
'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 $&-$1 EF-
-'*a'i - c - /*a/: ?+*{} follows nothing in regexp
-'(*)b'i - c - /(*)b/: ?+*{} follows nothing in regexp
+'*a'i - c - Quantifier follows nothing before HERE mark in regex m/* << HERE a/ at (eval 455) line 1, <TESTS> line 235.
+'(*)b'i - c - Quantifier follows nothing before HERE mark in regex m/(* << HERE )b/ at (eval 456) line 1, <TESTS> line 236.
'$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 - /abc)/: unmatched () in regexp
-'(abc'i - c - /(abc/: unmatched () in regexp
+'abc)'i - c - Unmatched ) before HERE mark in regex m/abc) << HERE / at (eval 468) line 1, <TESTS> line 243.
+'(abc'i - c - Unmatched ( before HERE mark in regex m/( << HERE abc/ at (eval 469) line 1, <TESTS> line 244.
'((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 - /a**/: nested *?+ in regexp
+'a**'i - c - Nested quantifiers before HERE mark in regex m/a** << HERE / at (eval 478) line 1, <TESTS> line 249.
'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 () in regexp
+')('i - c - Unmatched ) before HERE mark in regex m/) << HERE (/ at (eval 499) line 1, <TESTS> line 260.
'[^ab]*'i CDE y $& CDE
'abc'i n - -
'a*'i y $&
a(?:b|c|d){4,5}(.) acdbcdbe y $1 b
a(?:b|c|d){4,5}?(.) acdbcdbe y $1 d
((foo)|(bar))* foobar y $1-$2-$3 bar-foo-bar
-:(?: - c - /(?/: Sequence (? incomplete
+:(?: - c - Sequence (? incomplete
a(?:b|c|d){6,7}(.) acdbcdbe y $1 e
a(?:b|c|d){6,7}?(.) acdbcdbe y $1 e
a(?:b|c|d){5,6}(.) acdbcdbe y $1 e
^(a(?(1)\1)){4}$ aaaaaaaaaa y $1 aaaa
^(a(?(1)\1)){4}$ aaaaaaaaa n - -
^(a(?(1)\1)){4}$ aaaaaaaaaaa n - -
+((a{4})+) aaaaaaaaa y $1 aaaaaaaa
+(((aa){2})+) aaaaaaaaaa y $1 aaaaaaaa
+(((a{2}){2})+) aaaaaaaaaa y $1 aaaaaaaa
(?:(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 - -
(?<!c)b cb n - -
(?<!c)b b y - -
(?<!c)b b y $& b
-(?<%)b - c - /(?<%)b/: Sequence (?%...) not recognized
+(?<%)b - c - Sequence (?<%...) not recognized before HERE mark in regex m/(?<% << HERE )b/
(?:..)*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 - /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 - c - Sequence (?{...}) not terminated or not {}-balanced before HERE mark in regex m/a(?{ << HERE )b/ at (eval 780) line 1, <TESTS> line 400.
+a(?{{})b - c - Sequence (?{...}) not terminated or not {}-balanced before HERE mark in regex m/a(?{ << HERE {})b/ at (eval 781) line 1, <TESTS> line 401.
+a(?{}})b - c -
+a(?{"{"})b - c - Sequence (?{...}) not terminated or not {}-balanced before HERE mark in regex m/a(?{ << HERE "{"})b/ at (eval 783) line 1, <TESTS> line 403.
a(?{"\{"})b cabd y $& ab
-a(?{"{"}})b - c - Unmatched right bracket
+a(?{"{"}})b - c - Unmatched right curly bracket
a(?{$bl="\{"}).b caxbd y $bl {
x(~~)*(?:(?:F)?)? x~~ y - -
^a(?#xxx){3}c aaac y $& aaac
^(\(+)?blah(?(1)(\)))$ blah y ($2) ()
^(\(+)?blah(?(1)(\)))$ blah) n - -
^(\(+)?blah(?(1)(\)))$ (blah n - -
-(?(1?)a|b) a c - /(?(1?)a|b)/: Switch (?(number? not recognized
-(?(1)a|b|c) a c - /(?(1)a|b|c)/: Switch (?(condition)... contains too many branches
+(?(1?)a|b) a c - Switch condition not recognized before HERE mark in regex m/(?(1? << HERE )a|b)/ at (eval 868) line 1, <TESTS> line 444.
+(?(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 - -
([[:]+) a:[b]: y $1 :[
([[=]+) a=[b]= y $1 =[
([[.]+) a.[b]. y $1 .[
-[a[:xyz: - c - /[a[:xyz:/: unmatched [] in regexp
-[a[:xyz:] - c - /[a[:xyz:]/: unmatched [] in regexp
-([a[:xyz:]b]+) pbaq y $1 ba
+[a[:xyz: - c - Unmatched [ before HERE mark in regex m/[ << HERE a[:xyz:/ at (eval 950) line 1, <TESTS> line 476.
+[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 - /(?<=x+)y/: variable length lookbehind not implemented
-a{37,17} - c - /a{37,17}/: Can't do {n,m} with n > m
+(?<=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 $-[0] 1
a\Z a\nb\n n - -
-b\Z a\nb\n y - -
-b\z a\nb\n n - -
-b\Z a\nb y - -
-b\z a\nb y - -
+a\z a\nb\n n - -
+a$ 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 - -
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