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RegExr
RegExr is a HTML/JS based tool for creating, testing, and learning about Regular Expressions.
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I can see everyone is linking sites, but not regexr.com. This site is interactive, has a "cheat sheet" and reference material, and explains every part of a regex expression. I've worked through some pretty beastly regex on that site, and got it to do what I wanted while still looking pretty (and legible).