Special Sequence Characters

Pre-defined Characters

Character	Description	Equivalent
\w	Word characters (letters, digits, underscore)	[a-zA-Z0-9_]
\W	NOT word characters	[^a-zA-Z0-9_]
\d	Digits	[0-9]
\D	NOT digits	[^0-9]
\s	Whitespace characters	[ \t\n\r\f\v]
\S	NOT whitespace characters	[^ \t\n\r\f\v]