🔍 Regex Tester
Test regular expressions in real-time — see matches highlighted instantly with capture group details.
/
/
Flags:
Test String
Highlighted Matches
Quick Reference — Common Patterns
▼
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.