^	Start of string or line
\A	Start of string
$	End of string or line
\Z	End of string
\b	Word boundary
\B	Not word boundary
\<	Start of word
\>	End of word

Character Classes
\c	Control character
\s	Whitespace [ \t\r\n\v\f]
\S	Not Whitespace [^ \t\r\n\v\f]
\d	Digit [0-9]
\D	Not digit [^0-9]
\w	Word [A-Za-z0-9_]
\W	Not Word [^A-Za-z0-9_]
\x	Hexadecimal digit [A-Fa-f0-9]
\O	Octal Digit [0-7]

POSIX Classes
[:upper:]	Uppercase letters [A-Z]
[:lower:]	Lowercase letters [a-z]
[:alpha:]	All letters [A-Za-z]
[:alnum:]	Digits and letters [A-Za-z0-9]
[:digit:]	Digits [0-9]
[:xdigit:]	Hexadecimal digits [0-9a-f]
[:punct:]	Punctuation
[:blank:]	Space and tab [ \t]
[:space:]	Blank characters [ \t\r\n\v\f]
[:cntrl:]	Control characters [\x00-\x1F\x7F]
[:graph:]	Printed characters [\x21-\x7E]
[:print:]	Printed characters and spaces [\x20-\x7E]
[:word:]	Digits, letters and underscore [A-Za-z0-9_]

Pattern Modifiers
//g	Global Match (all occurrences)
//i	Case-insensitive
//m	Multiple line
//s	Treat string as single line
//x	Allow comments and whitespace
//e	Evaluate replacement
//U	Ungreedy pattern

Escape Sequences
\	Escape following character
\Q	Begin literal sequence
\E	End literal sequence

*	0 or more
+	1 or more
?	0 or 1 (optional)
{3}	Exactly 3
{3,}	3 or more
{2,5}	2, 3, 4 or 5

Groups and Ranges
.	Any character except newline (\n)
(a|b)	a or b
(...)	Group
(?:...)	Passive (non-capturing) group
[abc]	Single character (a or b or c)
[^abc]	Single character (not a or b or c)
[a-q]	Single character range (a or b ... or q)
[A-Z]	Single character range (A or B ... or Z)
[0-9]	Single digit from 0 to 9

?=		Lookahead assertion
?!		Negative lookahead
?>=		Lookbehind assertion
?!= / ?<!	Negative lookbehind
?>		Once-only Subexpression
?()		Condition [if then]
?()|		Condition [if then else]
?#		Comment
Special 	Characters
\n		New line
\r		Carriage return
\t		Tab
\v		Vertical tab
\f		Form feed
\ooo		Octal character ooo
\xhh		Hex character hh

String Replacement
$n	n-th non-passive group
$2	"xyz" in /^(abc(xyz))$/
$1	"xyz" in /^(?:abc)(xyz)$/
$`	Before matched string
$'	After matched string
$+	Last matched string
$&	Entire matched string

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