<[c]>			abcdef		y	character class
<[dcb]>**{3}		abcdef		y	repeated character class
^<[a]>			abcdef		y	anchored character class
<-[e]>			abcdef		y	negated character class
^<[a]>?			abcdef		y	anchored optional character class
<-[e]>?			abcdef		y	negated optional character class
<-[dcb]>**{3}		abcdef		n	repeated negated character class
^<-[e]>			abcdef		y	anchored negated character class
^<-[a]>			abcdef		n	anchored negated character class
<[b..d]>		abcdef		y	character range
<[b..d]>		abxxef		y	character range
<[b..d]>		axcxef		y	character range
<[b..d]>		axxdef		y	character range
<[b..d]>		axxxef		n	character range
<-[b..d]>		abcdef		y	negated character range
<-[b..d]>		bbccdd		n	negated character range
<-[d..b]>		bbccdd		n	negated (illegal) character range
<[-]>			ab-def		/parse error/	unescaped hyphen
<[\-]>			ab-def		y	escaped hyphen
<[\-]>			abcdef		n	escaped hyphen
<-[\-]>			---x--		y	negated escaped hyphen
<-[\-]>			------		n	negated escaped hyphen
<[\-+]>			ab-def		y	escaped hyphen in range
<[\-+]>			ab+def		y	escaped hyphen in range
<[\-+]>			abcdef		n	escaped hyphen in range
<[+\-]>			ab-def		y	escaped hyphen in range
<[+\-]>			ab+def		y	escaped hyphen in range
<[+\-]>			abcdef		n	escaped hyphen in range
<-[\-+]>		---x--		y	negated escaped hyphen in range
<-[\-+]>		------		n	negated escaped hyphen in range
<-[+\-]>		---x--		y	negated escaped hyphen in range
<-[+\-]>		------		n	negated escaped hyphen in range
<["\\]>			\\			y	escaped backslash
<[\]]>			]			y	escaped close bracket
<[\]>			\\]]		/parse error/	unescaped backslash (or no closing brace)
^\><[<]>			><		y	lt character class
^<[>]>\<			><		y	gt character class
^<[><]>**{2}		><		y	gt, lt character class
^<[<>]>**{2}		><		y	lt, gt  character class
^<-[><]>		><		n	not gt, lt character class
^<-[<>]>		><		n	not lt, gt  character class
<'... --- ...'>		... --- ...	y	literal match (\')
<'... --- ...'>		...---...	n	literal match (\')
<'ab\'>cd'>		ab'>cd		y	literal match with quote
<'ab\\cd'>		ab\x5ccd	y	literal match with backslash
<'?'>		ab<?	y	literal match with question mark
<'<'>		ab<?	y	literal match with lt 
<'<?'>		ab<?	y	literal match with lt and question mark
<'<?'>		ab<x?	n	non-matching literal match with lt and question mark
<[A..Z0..9]>		abcdef		n	two enumerated ranges
<[A..Z0..9]>		abcDef		y	two enumerated ranges

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