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Possible Duplicate:
Regular expression to match string not containing a word?
How can I invert a regular expression in JavaScript?
Say I have the regex foo123. How do I match everything that is not foo123?
Use negative lookahead for this.
matches any string except
foo123If you want to match empty string also, use
(?!foo123).*In your case (according to the comment) the required regex is
(?!P[0-9]{1,}).+.It matches P and 123, but not P123.