Regex Tester
Test regular expressions against sample text live.
Regex Tester lets you try JavaScript regular expressions with live flags (g, i, m, s, u) and see every match and capture group. Paste sample text, tweak the pattern, and iterate without leaving the browser.
Frequently Asked Questions
Does my text leave the browser?
No. This tool runs entirely in your browser. Nothing is uploaded to our servers.
Which regex flavor is used?
JavaScript RegExp — the same engine your browser uses for String.prototype.match.
Is there a match limit?
Yes. Results stop after 500 matches to keep the UI responsive on huge inputs.