Regex Match Tester
Test regex patterns with live match highlighting, capture groups, and replacements.
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Testing whether a regex matches something is only half the actual problem when the pattern is destined for a find-and-replace operation, since a replacement string with capture group backreferences, $1, $2, and so on, can silently produce something completely different from what was intended if a group is numbered wrong or a backreference points at the wrong part of the match. This tool tests a regex pattern against sample text and previews exactly what a replacement string produces, backreferences included, before that pattern gets used in an actual find-and-replace on real files or code.
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Useful for confirming a replacement string's backreferences pull the right captured groups into the output, catching a pattern that matches correctly but replaces incorrectly, or previewing a bulk find-and-replace safely before running it for real.
Key features
- Clean interface
- Fast processing
- No signup required
- Works offline