There are a number of candidates for this simple task, on-line and off.
This one is a good one ... http://www.regextester.com
... and this is a good resource for Regex http://regexlib.com
However, none do quite what I want and most do more than I want, like showing a group name (well maybe they do, I didn't look to hard)... so I've set about writing one. Its not going to teach you about regular expressions, its just a handy tool to help your author them.
If you like you can visit the project page and download the latest version, it does need .NET Framework 3.5 installed.
Its ClickOnce so updates will be automatic
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