RegexTool is a browser-based regular expression tester.

Leveraging the power of the XRegExp JavaScript regular expression library, RegexTool delivers an efficient and helpful interface to create, diagnose, and test your regular expressions.


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  • The XRegExp library adds new syntax and flags to the standard JavaScript regular expression library.
  • Offline access via browser application cache.
  • HTML5 Storage to save your data in between sessions.

Dual licensed under the MIT and GPL licenses.