Which regex flavour is used?

The JavaScript (ECMAScript) engine built into your browser, so results match what runs in Node.js and the browser.

Why does my pattern only match once?

Enable the g flag. Without it the engine stops after the first match.

Is my test data sent anywhere?

No. The pattern is executed locally against your sample text and nothing leaves the page.

Regex Tester

Test regular expressions with live matches and capture groups.

Pattern

Regex pattern

//gi

Test string

Contact us at hello@devtoolkit.dev or support@example.com.

Matches (2)

hello@devtoolkit.devat index 14
support@example.com.at index 38

Common regex examples

About the Regex Tester

Regular expressions are quick to write and hard to verify by reading. Testing against real sample text is the fastest way to confirm a pattern does what you expect.

Matches are highlighted in place and listed with their index and capture groups. The flags control global matching, case sensitivity, multiline anchors, dot-matches-newline and Unicode mode.