Try this:
regexlib.com/RETester.aspx
( magnum, Tue 27 Nov 2007, 20:00, archived)

Eh?

( WHARRGARBL, Tue 27 Nov 2007, 20:00, archived)

It allows you to test whether the regular expression will work
on input values.
( magnum, Tue 27 Nov 2007, 20:02, archived)

Oh okay.

( WHARRGARBL, Tue 27 Nov 2007, 20:03, archived)