Regex Tester.
Test regex patterns with live match highlighting. Supports named groups, flags, and all modern JavaScript regex features.
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How to use
Enter a regular expression pattern.
Toggle flags (i, m, s) as needed.
Type or paste the test string — matches are highlighted live.
Frequently Asked Questions
Which regex flavour is used?
JavaScript (ECMAScript) regex via the built-in RegExp engine. Named capture groups (?<name>...) and lookbehind (?<=...) are supported in all modern browsers.
Why does my pattern match nothing?
Check your flags — the default is case-sensitive and single-line. Toggle the i flag for case-insensitive matching, or s for dot-matches-newline.
How do I use named groups?
Use the syntax (?<groupname>pattern). Named group values appear in a table below the highlighted matches.
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