Making string validation faster by not using a regular expression. A story. - Maarten Balliauw {blog}
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Essential Guide To Regular Expressions: Tools and Tutorials — Smashing Magazine
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10 RegEx Tester for JavaScript, Python, PHP, Golang, Ruby, etc.
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Fault‐based test generation for regular expressions by mutation - Arcaini - 2019 - Software Testing, Verification and Reliability - Wiley Online Library
JavaScript Regular Expression Tester - CodeProject
