Regex Tester — Test Regular Expressions with Live Match
Test regular expressions against sample text with instant feedback. See matches highlighted in real-time, extract capture groups, and validate your regex patterns before using them in code. Supports global (g), case-insensitive (i), multiline (m), and other JavaScript regex flags.
Features
- Real-time pattern matching
- Support for multiple regex flags (g, i, m, s, u)
- Match highlighting with capture groups
- Detailed match information and statistics
- Common regex patterns library
- 100% client-side processing
Regular Expression Testing
- JavaScript Engine: This tool uses JavaScript's RegExp engine for pattern testing
- Live Testing: Test your patterns against real text with instant visual feedback
- Privacy: All testing happens locally in your browser - no data is sent to servers
Useful Resources
Wikipedia: Regular Expression Beginner-friendly introduction to regular expressions
MDN Regular Expressions Guide Comprehensive guide to regular expressions in JavaScript by Mozilla
Regular-Expressions.info In-depth tutorial and reference for regex patterns and syntax
RegExr - Community Patterns Learn regex with thousands of community-contributed patterns
Regex101 - Testing & Debugger Advanced regex testing with explanation and visualization