Need help with regexr?
Click the “chat” button below for chat support from the developer who created it, or find similar developers for support.


RegExr is a HTML/JS based tool for creating, testing, and learning about Regular Expressions.

7.1K Stars 748 Forks GNU General Public License v3.0 378 Commits 106 Opened issues

Services available

Need anything else?


About is an online tool to learn, build, and test Regular Expressions. It was created by Grant Skinner and the nice people at


  • Results update in real-time as you type.
  • Supports JavaScript & PHP/PCRE RegEx.
  • Roll over a match or expression for details.
  • Save & share expressions with others.
  • Use Tools to explore your results.
  • Browse the Reference for help & examples.
  • Undo & Redo with cmd-Z / Y in editors.
  • Search for & rate Community patterns.

Issues & Feature Requests

Please report issues & feature requests on GitHub. Please do not post questions about regular expressions (use Stack Overflow instead).


If you would like to contribute back to please send us pull requests.

Please make sure they are well formatted and follow the style specified out in the existing files.


This version of RegExr is licensed under GPL v3. If you're interested in using the source under other terms, feel free to get in touch.


RegExr uses Gulp to manage the build process. You will need to install Node and Gulp, and install other dependencies via

npm install
. Running
(default) will run dev builds and set up a test server.

We use cookies. If you continue to browse the site, you agree to the use of cookies. For more information on our use of cookies please see our Privacy Policy.