Regex

Vinod Pahuja

[^a-z0-9_]

The three escape characters are

\ escapes any character,

\b escapes a word boundary, and

\D escapes any character except a digit.

qoute string  - "([^"])*"|'([^'])*'|[\W][\d]+

only number [0-9]+

\d  Any digit	[0-9]
\s	Any whitespace character (space, tab, newlines)	[ \t\n\r\f]
\w	Any ‘word character’ - letters, numbers, and underscore	[A-Za-z0-9_]
\b	A word boundary character	no equivalent
\D	The inverse of \d i.e. any character except a digit	[^0-9]
\S	Any non-whitespace character	[^ \t\n\r\f]
\W	Any non-word character