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Regex Tester

Test and debug regular expressions with live match highlighting, capture groups and replace preview.
Regex Tester

Details

Test, build and debug JavaScript regular expressions directly in your browser.

Type a pattern, toggle flags and see every match highlighted in your test string in real time. Inspect each match together with its numbered and named capture groups, and preview the result of a replacement using $1, $<name> and $& substitutions.

Everything runs locally using the native JavaScript regular expression engine, so your patterns and test data never leave your device.

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