Is there any good regex webapps out there?

I'd like to be able to set which type of regex syntax is used, enter some text and a regex and get matches highlighted. Preferably with different colors so it's easy to detect what in the regex is causing the match.

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  • this answer makes me smile. +1 – Justin L. Jul 8 '10 at 9:49
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    +1 for regexpal - using it for more than 6 years or so... – mbrochh Jul 8 '10 at 10:11
  • its hard to see for which of your given options people are now voting ... – akira Jul 8 '10 at 10:29
  • strfriend.com is no more – Eric Jun 9 '12 at 12:40

http://gskinner.com/RegExr is good.

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I use the RegexTester to do this, the site is pretty simple and does just what you ask.

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I've always used regexlib.com (here is their testing page, they even have a silverlight engine in there which is quite cool). They also have a great library of regexes that people have submitted.

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Includes visualizer for the pipes and colored visualizer for the test text matches.

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  • No need to down-vote carelessly. The accepted answer added the Debuggex link using the "Edit" function after my answer was made. If the earlier answers should not contain same links as the accepted answer then one should down-vote all of the earlier answers around here, right? – Roland Pihlakas Jul 27 '18 at 0:37

reAnimator is a great regular expression visualizer. It helped me optimize some tricky regexes.

Update: Sorry, dead link. The closest thing I could find was this FSM simulator.

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  • Dead hyperlink :( – MattAllegro Jul 1 '18 at 16:25

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