Regex Tester
Write a regex pattern and test matches, groups, and replacements live.
Test regular expressions against sample text.
How to use
- Enter your regular expression pattern.
- Paste sample text to test against.
- View highlighted matches and capture groups.
- Adjust flags such as global or case-insensitive if offered.
About Regex Tester
Test regular expressions against sample text.
Runs in your browser — your files and input stay on your device.
Frequently asked questions
Which regex flavor is used?
JavaScript regular expression syntax.
Is my text uploaded?
No. Testing is done locally.
Can I test replacements?
Yes, if the tool includes a replace mode.