Regex Tester

About this tool

Test JavaScript-flavored regular expressions against sample text and instantly see every match, its position, and any capture groups. Adjust the pattern and flags (like g, i, m) and results update live. Invalid patterns show the exact error. Everything runs in your browser.

FAQ

Which regex flavor is this?

JavaScript (ECMAScript) regular expressions, the same engine used in Node.js and browsers.

What do the flags mean?

g = global (all matches), i = case-insensitive, m = multiline, s = dotall. The tool adds g automatically so you see every match.

Is my text uploaded?

No — matching runs locally in your browser.