How To Negate Regex

2018-06-04 01:02:29

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.

(?!foo123).+

matches any string except foo123

If 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 .

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