# 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