User:Eugrus/regex

Syntax	BRE	ERE	PCRE
Anchors	^ $	^ $	^ $ \A \Z
Character Classes	[abc] [a-z] [^abc]	[abc] [a-z] [^abc]	[abc] [a-z] [^abc] \d \D \s \S \w \W
Quantifiers	* \{m,n\}	* + ? \{n\} \{n,\} \{n,m\}	* + ? \{n\} \{n,\} \{n,m\} lazy matching
Grouping	\(abc\)	(abc)	(abc) (?:abc)
Alternation	N/A	def	def (?>abc)
Capturing Groups	\1 \2	\1 \2	\1 \2 (?P<name>)
Lookahead/Lookbehind	N/A	N/A	(?=abc) (?!abc) (?<=abc) (?<!abc)
Backreferences	\1 \2	N/A	\1 \2
Comments	N/A	N/A	(?#comment)