Regex Tester

Test regular expressions online with real-time match highlighting. Supports all JS regex flags. Instant feedback.

Test String

Matches (0)

Enter a regex pattern to see matches

How to Use

Type your regex pattern between the slashes
Toggle flags: g (global), i (case-insensitive), m (multiline), s (dotall), u (unicode)
Paste or type your test text below
Matches are highlighted in yellow — see match details on the right

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Frequently Asked Questions

What regex flavor is used?

We use JavaScript's built-in RegExp engine. This matches what you'd use in Node.js, browser JavaScript, and most online code editors.

Why am I getting no matches?

Check the pattern for typos. Use the global flag (g) to find all matches. The dotall flag (s) makes . match newlines. See the error message if the pattern syntax is invalid.