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Regex Tester

Test regular expressions with live matching, replace, and capture groups. Runs completely in your browser.

About This Tool

Tests a regular expression against sample text with live match highlighting, capture groups, and a replace mode that supports $1-style references. Toggle flags like global, case-insensitive, and multiline to see exactly how they change the match.

Frequently Asked Questions

Which regex flags are supported?+

Global (g), case-insensitive (i), multiline (m), dot-all (s), and unicode (u). Toggle any combination and matches update live.

Can I see capture groups for each match?+

Yes. Every match lists its numbered and named capture groups below the match text.

Does the Replace mode support capture group references?+

Yes, use $1, $2, etc. in the replacement field to reference captured groups from your pattern.

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