pegboard is a social bookmarking service that lets you save, search, share and tag your bookmarks with people all over the world!
A "Regular Expression Generator" for strings.
Gruber updates his URL regex.
Rubular is a Ruby-based regular expression editor. It's a handy way to test regular expressions as you write them. Rubular is an especially good fit for Ruby and Rails developers, since it uses Ruby on the server to evaluate regexes.
Devoted to regular expressions.
text artisan guild presents a very nice beginner's tutorial for regular expressions.
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