Developer Utilities · Free tool
Regex Tester
Test regular expressions against sample text with live match highlighting. Supports common flags and groups.
Updated April 2026
2 matches
- @12: hello@example.com
- @33: Support@Acme.io
What it does
A free regex tester. Enter a pattern and flags; test against any string and see all matches highlighted. Useful for building and debugging regular expressions before using them in code.
Regex is both powerful and unforgiving. Test patterns here until they behave correctly, then paste into your codebase. See our debugging guide.
How to use it
- Enter your regex pattern.
- Set flags (g, i, m, s) as needed.
- Paste test text into the input.
- Review matches highlighted live.