Regex Tester

Test a search pattern

Try a regular expression and see every match.

Type a pattern and some text

PatternText

This all happens on your device. Nothing you type or add is sent anywhere. Check it yourself

Which regex flavour is this?

JavaScript (ECMAScript), as used in browsers and Node.js. Most patterns work the same in other languages; lookbehind and named groups are supported.

Is my text sent anywhere?

No. Matching runs in this tab, and the page's security policy blocks any outside connection.

Runs	In your browser. Your files stay on your device.
Engine	Your browser's JavaScript regex engine
Flags	g, i, m, s, u and y
Works offline	Yes, once the page has loaded
Licence	AGPL-3.0
Added	28 September 2026
Built by	Sapience Design
Source	tools/developer/regex-tester