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Regex Tester & Debugger

Test and debug regular expressions online with live highlighting. See all matches, groups and capture groups instantly. Free browser-based regex tool — no data sent to servers.

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Frequently Asked Questions

What regex flavour does this use?

This tool uses JavaScript's native RegExp engine. It supports most common regex features: character classes, groups, lookaheads, backreferences and all standard flags (g, i, m, s).