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rubular - A ruby based regular expression editor

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RegExr - RegExr.com is an online tool to learn, build, and test Regular Expressions.

Ghost - Ghost is a fully open source, adaptable platform for building and running a modern online publication. We power blogs, magazines and journalists from Zappos to Sky News.

RegEx Generator - RegEx Generator is a simple-to-use application that comes with the brilliance of intuitive regex and is also helping you out to test the regex.