In-browser tool

Regex tester

Test a regular expression against text with live matches and groups.

Pattern

Flags

Everything runs in your browser — your input is never uploaded.

How it works

Type or paste your input

Get the result instantly

Copy the result

Which regex syntax?

JavaScript (ECMAScript) regular expressions with the g, i, m, s, u and y flags.

Is my file uploaded to a server?

No. This tool runs entirely in your browser. You can open your browser's network tab and verify no request carries your file.