I find the regular expression toolkit tool in Komodo 4.1 pretty handy. Trouble is you have to dish out $300 for Komodo to use it. I'd love the same functionality in a stand alone tool... any suggestions?
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Komodo 5.2 is the latest version, FYI. – Sridhar Ratnakumar Sep 16 '09 at 02:01
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I just found https://www.debuggex.com and it's pretty awesome looking, it provides an interesting visual map of what your regex pattern is doing. – Peter Hanley Mar 27 '15 at 19:23
6 Answers
If using the JavaScript regular expression engine is acceptable, there's a nice one written by Erik Arvidsson. It doesn't have the "Replace" features that Komodo IDE's Rx Toolkit has, but it's helpful for testing matches.
He wrote for use with Komodo Edit - I guess he didn't want to shell out for the IDE either. ;)
Disclosure: Sridhar and I work for ActiveState, so we tend to push Komodo IDE. If $295 is a barrier for you, just tell our sales folks that you're a friend of Sridhar from stackoverflow and they might be able to swing a deal for you. We'll take it out of his pay.
Update: More shilling if that's OK. There's a sale on till the end of October. $50 off!

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2As stated elsewhere, I need the replace feature, so the first link's no good. However, the second link has a comment with a link to a tool that will do the trick: http://osteele.com/tools/rework/#. Thanks! – fakeleft Sep 23 '09 at 01:08
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1I'd be more than happy to pay for the RX tool, I just don't have any other use for the IDE. Maybe you guys could spin it off into a separate product? – Jeremy Logan Oct 03 '11 at 14:54
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I used the ide and wouldn't use it again. But i really miss this toolkit. Please consider separating it. – pscheit Sep 04 '13 at 07:26
I have occasionally used the Regular Expression Labratory
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Thanks - that's the idea, but it seems buggy - for instance, it throws an error on a simple ".*"... I'd accept your answer otherwise. – fakeleft Sep 12 '09 at 21:48
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Second the buggy comment! Also its very vauge on the Re syntax actually supported (perl, pcre, sed, awk etc. etc.) – James Anderson Sep 16 '09 at 02:17
Give the open-source app Kodos a try.
But I suggest that you use Komodo (do you want a discount?) - it contains much more features than Rx toolkit.

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1Thanks, but the replace feature is a must. I have a komodo license (kudos!), but I'd prefer something stand-alone so it launches quicker, etc. – fakeleft Sep 23 '09 at 00:50
I personally think this site rocks! It has match and replace. Try it and let me know:

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I love this Adobe Air tool. Great for testing out expressions before trying them in the wild. It is a desktop app version of the online tool that he provides - all free.

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Damian Conway made a free regular expression debugger module that allows you to visualize a regular expression as it backtracks, fails, and/or matches: Regexp::Debugger.
Video of it in action: Damian Conway on Regexp::Debugger at YAPC::NA 2012

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