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Comment by irrational | Hacker News Reader

Other Regex resources I like include:

This one is great too: http://regexr.com/

This is my go to when trying to figure out why a regex isn't working how it should.

I like Explain Regular Expressions [0] too.

I've always liked http://perldoc.perl.org/perlre.html , obviously it's perl specific but most of it can be applied to other implementations.

In perl you can use:

    use re 'Debug';

or even better

    use re 'debugcolor';

and watch the state machine matching.

Very useful for debugging.

Another great resource is:

Thanks to those who posted additional resources!

This is also nice to use to visualize regex expressions. It updates the url so you can add it a comment to code: