Regex Tester Pro - Test and Explain Regular Expressions

Test, debug and master regex in your browser. AI-powered generation, multi-flavor support, and real-time match highlighting.

Regex Tester Pro is a fast, powerful regular expression tester built directly into your browser. Write, test, debug, and refine regex patterns with instant real-time feedback — no need to open a separate tab or leave Chrome. REGEX TESTING: • Real-Time Matching — See highlighted results instantly as you type your pattern • Capture Group Inspection — View all groups, named groups, and backreferences at a glance • Syntax Highlighting — Color-coded match groups for fast visual pattern analysis • Replace Mode — Test regex find-and-replace operations before using them in code • Multi-Line Input — Paste large blocks of text with match count and position indicators DEVELOPER TOOLS: • Built-In Cheat Sheet — Quick reference for regex syntax, flags, and common patterns • Save & Organize Patterns — Store your tested regex patterns for easy reuse • All JavaScript Flags — Full support for g, i, m, s, u, and y flags • Works Offline — No server calls, test patterns even without an internet connection Runs 100% in your browser. No external servers, no data collection, no tracking, no ads.