🛡️ 100% Browser Local Execution · Zero Upload Privacy · Instant Speed
Regex Tester & AI Pattern Library
Real-time regular expression debugger with match highlighting, capture group extraction, and 20+ built-in patterns.
📖 How to Use & Technical Guide
- Click any quick preset button (Email, URL, IPv4, Date, Chinese Phone, Hex Color) or type your custom regex pattern and flags (g, i, m).
- Enter or paste your test string to see all matches and capture groups extracted instantaneously.
- Optionally test regex replacements using $1, $2 capture group references.
❓ Frequently Asked Questions
Are my test strings or logs sent to any backend server?
No. Regular expression evaluation runs 100% inside your browser's native RegExp engine.