I'm using this file to test regular expressions. I created this when I had to work on a project that had a huge amount of regular expressions and the need arose to just simply test them one by one before getting them in the form, eliminating the need to re-enter a dozen or-so fields just to test one lousy expression. Of course this tester just runs JavaScript regular expressions but, since these are mostly similar to other implementations, you could use it to pre-test Java or PERL regexp's too.

RegExp

Enter a regular expression and a text to test it on and hit test.

(Check this box for /.../ type expressions)
'String Safe' cut and pastes

Escaped to be cut and pasted in strings.

Off course testing doesn't always end after the first session, so here's a generated .