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

Open Source

The award-winning Expresso editor is equally suitable as a teaching tool for the beginning user of regular expressions or as a full-featured development environment for the experienced programmer with an extensive knowledge of regular expressions.

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Extensive regex tester and debugger with highlighting for PHP, PCRE, Python and JavaScript.

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.

Open Source

RegexPlanet offers a free-to-use Regular Expression Test Page to help you check RegEx in Ruby free-of-cost.

Use RegexMagic to generate complete regular expressions to your specifications by using RegexMagic's flexible patterns, instead of the cryptic regex syntax.

The Regex Coach is a graphical application for Windows which can be used to experiment with...

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Regex Widget is a lightweight, easy-to-use regular expression tester released under the LGPL license.

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Open Source

Regex Regular Expression Tool is an application that serves developers and those looking to practice and learn about regular expressions.

Open-source, regular expression parser and visualizer.

This script allows for the testing of regular expressions for both RegExMatch() and RegExReplace().