[anthonylebrun]

Admittedly I haven't spent too much time testing your product, but I just wanted to point out a few free tools that have been around for a while (which I use often):

http://www.gethifi.com/tools/regex (js regex tester) http://rubular.com/ (ruby regex tester)

Have you heard of/tried these before?

[hipsters_unite]

That was exactly my first thought - I use rubular all the time and it's a great scratchpad for regexes.