Regex Tester

Test a regular expression live

This regex tester runs a JavaScript regular expression against sample text and highlights every match as you edit the pattern. Add flags such as g for global, i for case-insensitive and m for multiline. An invalid pattern shows a clear error, so you can build a complex expression a piece at a time.

How to test a regex

Enter your pattern and flags, paste text to test against, and matches are highlighted and counted as you type.

Frequently asked questions