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# brackets, and numerous perversions thereof
a[b]c & abc abc
a[ab]c & abc abc
a[^ab]c & adc adc
a[]b]c & a]c a]c
a[[b]c & a[c a[c
a[-b]c & a-c a-c
a[^]b]c & adc adc
a[^-b]c & adc adc
a[b-]c & a-c a-c
a[b &C EBRACK
a[] &C EBRACK
a[1-3]c & a2c a2c
a[3-1]c &C ERANGE
a[1-3-5]c &C ERANGE
a[[.-.]--]c & a-c a-c
a[1- &C ERANGE
a[[. &C EBRACK
a[[.x &C EBRACK
a[[.x. &C EBRACK
a[[.x.] &C EBRACK
a[[.x.]] & ax ax
a[[.x,.]] &C ECOLLATE
a[[.one.]]b & a1b a1b
a[[.notdef.]]b &C ECOLLATE
a[[.].]]b & a]b a]b
a[[:alpha:]]c & abc abc
a[[:notdef:]]c &C ECTYPE
a[[: &C EBRACK
a[[:alpha &C EBRACK
a[[:alpha:] &C EBRACK
a[[:alpha,:] &C ECTYPE
a[[:]:]]b &C ECTYPE
a[[:-:]]b &C ECTYPE
a[[:alph:]] &C ECTYPE
a[[:alphabet:]] &C ECTYPE
[[:alnum:]]+ - -%@a0X- a0X
[[:alpha:]]+ - -%@aX0- aX
[[:blank:]]+ - aSSTb SST
[[:cntrl:]]+ - aNTb NT
[[:digit:]]+ - a019b 019
[[:graph:]]+ - Sa%bS a%b
[[:lower:]]+ - AabC ab
[[:print:]]+ - NaSbN aSb
[[:punct:]]+ - S%-&T %-&
[[:space:]]+ - aSNTb SNT
[[:upper:]]+ - aBCd BC
[[:xdigit:]]+ - p0f3Cq 0f3C
a[[=b=]]c & abc abc
a[[= &C EBRACK
a[[=b &C EBRACK
a[[=b= &C EBRACK
a[[=b=] &C EBRACK
a[[=b,=]] &C ECOLLATE
a[[=one=]]b & a1b a1b
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