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RegexBuddy: Learn, Create, Understand, Test, Use and Save Regular Expression
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![Tools for Working with Regular Expressions - Regular Expressions Cookbook [Book]](https://www.oreilly.com/library/view/regular-expressions-cookbook/9780596802837/httpatomoreillycomsourceoreillyimages649814.png "Tools for Working with Regular Expressions - Regular Expressions Cookbook [Book]")
Tools for Working with Regular Expressions - Regular Expressions Cookbook [Book]
Essential Guide To Regular Expressions: Tools and Tutorials — Smashing Magazine
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Ultimate Guide to Regular Expressions in Google Analytics
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Rex - Regular Expression Exploration - Microsoft Research
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