Utilo

Regex Tester

Test and debug JavaScript regular expressions with live match highlighting, capture groups and flags.

About the Regex Tester

Test and debug JavaScript regular expressions with live match highlighting, capture groups and flags. It is part of Utilo, a collection of free developer utilities designed to be fast, accessible and beautiful on any device.

Is my data safe?

Yes. All processing happens directly in your browser using JavaScript, Web Workers and Web APIs. Nothing you type, paste or upload is sent to our servers.

Common uses

  • regex tester
  • regular expression tester
  • regex online
  • javascript regex