An online tool for learning, building, & testing regular expressions. RegExr lets you quickly create regular expressions with results updating in real-time as you type. You can roll over any match or expression for details such as range, groups and reference. Expressions can be saved & shared with others or you can search for and rate community patterns. RegExr also includes a complete regular expression reference library, cheatsheet, and several examples to help you get your patterns right.

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