Which regex flavor is supported?

It uses JavaScript regular expressions.

Can it show capture groups?

Yes. Matched groups are listed for each match.

No. Everything runs in the browser.

Developer Tools

Try regex patterns locally with flags, highlighted matches, and captured groups.

Regex Tester lets you try JavaScript regular expressions against sample text.

Enter a pattern, choose flags, paste sample text, and review highlighted matches plus captured groups.

The tool creates a browser `RegExp` with your flags and iterates matches locally, protecting against empty-match loops.

Patterns and sample text stay on the page.

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