Perl - Regular Expression Syntax

The Perl You Need to Know: Basic Regular Expression Syntax
.	any single character
*	zero or more of the previous character
+	one or more of the previous character
?	zero or one of the previous character
( )	grouping
[ ]	any character from the set
[^]	any character not from the set
{min,max}	range of occurrences

Character Classes		Anchor Sequences
\d	Any digit [0-9]	^	Beginning of data string
\D	Any non-digit [^0-9]	$	End of data string
\w	Any alphanumeric [a-zA-Z0-9_]	\b	A word boundary
\W	Any non-alphanumeric [^a-zA-Z0-9_]	\B	Any place except a word boundary
\s	Any space [ \t\n\r\f]
\S	Any non-space [^ \t\n\r\f]

Escape Sequences
\n	Newline character, aka linefeed. This is the typical end-of-line character.
\r	Carriage return character.
\t	Tab character.
\e	Escape character.
\xFF	A hexadecimal value in place of "FF".

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