Regex Tester
Preview both JavaScript regex match results and replacement results in one page.
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Enter a regular expression to start testing
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Preview both JavaScript regex match results and replacement results in one page.
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Two preview modes
- Match mode shows matches, capture groups and named groups.
- Replace Preview mode shows the transformed output without overwriting the source input immediately.
Notes
- The engine follows JavaScript regex semantics rather than PCRE or other runtime-specific extensions.