
\d	ڸ Ŵ == [0-9]
\D	ڰ ƴ  Ŵ == [^0-9]
\s	 ڸ Ŵ == [ \t\n\r\f\v]
\S	  ڸ Ŵ == [^ \t\n\r\f\v]
\w	 ڸ Ŵ == [a-zA-Z0-9_]
\W	  ڸ Ŵ == [^a-zA-Z0-9_]
\b	matches a word-boundary (NOTE : within a class, matches a backspace)
\B	matches a non-wordboundary
