Regex tester & extractor online

Validate and debug regular expressions instantly: run a test match, inspect capture groups, or extract every match from your text — all locally in your browser.

How to Regex tester & extractor

1. Step 1. Type your pattern and optional flags (g, i, m, s, u, y) into the pattern bar.
2. Step 2. Paste the text to test into the Input Buffer.
3. Step 3. Click Test Match, Extract All, or Count and read the result in the Output Buffer.

Frequently asked questions

Is a regex test built with JavaScript syntax?

Yes. Patterns are compiled as native JavaScript RegExp objects, so lookaheads, named groups, and all ECMAScript features work as expected.

Can I reuse a match for multiple lines?

Set the g flag for global matching and use Extract All to list every match with its capture groups.

Does the regex tester upload my text?

No. Matching executes fully in your browser — the text and pattern never leave your device.