Learn, Build, & Test RegEx

RegExr is an online tool to learn, build, & test Regular Expressions (RegEx / RegExp).

  • Supports JavaScript & PHP/PCRE RegEx.
  • Results update in real-time as you type.
  • Roll over a match or expression for details.
  • Validate patterns with suites of Tests.
  • Save & share expressions with others.
  • Use Tools to explore your results.
  • Full RegEx Reference with help & examples.
  • Undo & Redo with {{getCtrlKey()}}-Z / Y in editors.
  • Search for & rate Community Patterns.

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