Regex Tester
Test regular expressions with live highlighting and replace.
- 100% free
- JavaScript flavour
- Runs in your browser
Last reviewed by the OnlineToolPro team
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Matches
Enter a pattern and some text to see matches highlighted.
What is the Regex Tester?
Write a regular expression and see every match highlighted as you type, with capture groups listed. Try a replacement to see the result. Uses the JavaScript regex engine built into your browser.
How it works
How to use the Regex Tester
3 simple steps. No experience needed.
What can you use it for?
- Build and debug a pattern before putting it in code.
- Find all email addresses or dates in some text.
- Preview a find-and-replace across a document.
FAQ
Frequently asked questions
Which regex flavour is this?
JavaScript (ECMAScript). Most patterns work the same in other languages, but some features differ.
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