Regex Tester

Test and debug regular expressions in real time. Paste your regex pattern, enter a test string, and instantly see all matches highlighted — with detailed match info, group captures, and index positions.

• Real-time pattern matching with visual highlighting
• Support for all JavaScript regex flags (g, i, m, s, u, y)
• Named and numbered capture group display
• Common pattern presets for quick testing
• 100% client-side: your data never leaves your device

🔍 Visual Match Highlighting

See exactly which parts of your text match the pattern, highlighted directly in the test string. This makes it easy to verify complex patterns and catch edge cases instantly.

🛠️ Essential for Developers

Whether you're writing validation rules, parsing log files, or building search functionality, this regex tester helps you iterate quickly and get your patterns right the first time.

🔒 Private and Offline

All processing happens locally in your browser. Your test data and patterns are never transmitted, stored, or logged anywhere.