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I had the older version bookmarked http://gskinner.com/RegExr/ which now redirects to this site. Some other good sites that I've used are:

http://regviz.org/

https://regex101.com/

http://osteele.com/tools/rework/

http://www.rexv.org/

https://www.debuggex.com/

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I'd add http://regexpal.com/ for historical completeness. It's the first such tool I used and prefer it even today. Very sad that from what it seems Steven Levithan sold entire domain recently and is not updated anymore. Even permalinks broke last year. (I'm a bit worried, what's up with Steven.)

Regex 101 is fantastic, I love how it provides a plain english explanation.

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