Regex Tester & Pattern Library
Test regular expression patterns with live match highlights and common pattern presets 100% locally in your browser.
//
Presets:
Test String
Matches (2)
support@strinza.devIndex: 14
hello@example.comIndex: 37
Regular Expression (Regex) Testing & Pattern Reference Guide
Test JavaScript RegExp expressions in real-time with instant token matches, capture groups, and index positions.
1. Common Flags
g (global), i (case-insensitive), m (multiline).
2. Pre-Built Presets
Instantly load production-ready regex rules for Email validation, Web URLs, and IPv4 addresses.
3. 100% Client-Side
All regex evaluations execute locally in browser memory without sending string data to external APIs.