🔍 Regex Tester
Test regular expressions in real-time, see matches highlighted instantly with capture group details.
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Flags:
Test String
Highlighted Matches
Quick Reference, Common Patterns
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How the Regex Tester Works
This tool uses JavaScript's built-in RegExp engine to test regular expressions in real-time. It supports:
- Real-time matching: See matches highlighted as you type, with zero delay
- Capture groups: Named and numbered groups shown for each match
- All standard flags: Global (g), case-insensitive (i), multiline (m), dotall (s)
- Syntax validation: Instant error feedback for invalid patterns
- Quick reference: Click any common pattern to load it instantly
Everything runs locally in your browser, no data is sent to any server. Unlimited use, no signup required.