We built a regex tester so you can try patterns before putting them in code. Everything runs locally in your browser.
How the regex tester works
- Enter your regex pattern in the top box.
- Paste sample text in the bottom box.
- Matches are highlighted as you type.
- Turn flags on or off: global, case-insensitive, multiline, and more.
- See capture groups and try replace previews.
Cheat sheet
The cheat sheet lists common tokens—anchors, character classes, quantifiers, and lookarounds—in one page you can keep open while testing.
