Regex Tester Online Free

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Test String
Matches & Highlighted
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Test Regular Expressions Instantly

Enter a regex pattern and test string to see matches highlighted in real time. Supports all JavaScript regex flags (global, case-insensitive, multiline, dotAll, unicode). View capture groups and match positions.

About this tool

A real-time regex playground for testing and debugging regular expressions. See matches highlighted as you type with support for capture groups and all standard flags.

  • Real-time matching as you type
  • Capture group display
  • All JS regex flags (g, i, m, s, u)
  • Match highlighting with positions

100% client-side. Your data never leaves your browser. No tracking, no cookies.