Test regular expressions with highlighted matches, groups and a cheat sheet. Runs entirely in your browser, nothing is stored.
.any character\d \w \sdigit, word char, whitespace\D \W \Snot digit / word / space[abc] [^abc]one of / none ofa* a+ a?0+, 1+, 0 or 1a{2,5}between 2 and 5^ $start / end of line\bword boundary(x) (?:x)capture / non-capture(?<name>x)named groupa|ba or b(?=x) (?!x)lookahead / negativeRuns in a background worker with a 1 second limit, so a bad pattern can't freeze the page.
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