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Regex Tester

Test and debug regular expressions in real time

100% FreeRuns in your browserNo sign-up

About this tool

Build and test regular expressions with instant visual feedback. See matches highlighted in your test string as you type, inspect capture groups, and use replace mode to test substitutions. Quick-insert common patterns for emails, URLs, phone numbers, dates, and IP addresses.

Features

  • Real-time match highlighting
  • Flag toggles (g, i, m, s, u)
  • Capture group inspection
  • Find and replace mode
  • Common pattern quick-insert presets

Use cases

Debugging regular expressionsValidating input patternsBuilding search-and-replace rules

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