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Regex Tester

Live regex matching with coloured capture groups, match positions, and one-click patterns for common formats. Zero network requests.

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Capture Groups

Groups are colour-coded by index: group 1 is blue, group 2 green, group 3 orange, group 4 pink. Full matches with no groups are highlighted in yellow.

Flags

  • g — find all matches, not just the first
  • i — case-insensitive matching
  • m — ^ and $ match line boundaries
  • s — dot matches newlines (dotall mode)
  • u — full Unicode support

How to Use

  • Type a regex pattern in the top bar.
  • Toggle flags as needed.
  • Paste test text — matches highlight in real time.
  • Use Quick buttons to load common patterns instantly.

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