Regular Expressions

.	Any character except newline	\c	Control character
\d	Digit	\D	non Digit
\s	Whitespace	\S	non Whitespace
\w	Word character [A-Za-z0-9]	\W	non Word character
^	Start of string	$	End of string
*	0 or more matches of previous expression
+	1 or more matches of previous expression
?	0 or 1 matches (optional). Stop search as soon as next expression is found (non greedy)