Test regular expressions with live pattern matching and debugging
Enter a pattern and test string to see matches
Professional regex tools for developers, data analysts, and text processing specialists
Real-time pattern testing with instant match highlighting and comprehensive validation feedback
Professional syntax highlighting with error detection and pattern explanation features
Detailed match information including groups, captures, and position analysis with debugging
Complete flag support including global, multiline, case-insensitive, and unicode options
Comprehensive collection of common patterns for validation, extraction, and processing
All pattern testing happens locally in your browser with complete data privacy and security
Everything you need to know about regular expressions, pattern matching, and text processing
Regular expressions (regex) are powerful pattern-matching tools that use special syntax to define search patterns for text. They include literal characters, metacharacters, character classes, quantifiers, anchors, and groups for matching, validating, and extracting data from text.
Our tester supports standard regex syntax including character classes, quantifiers, anchors, alternation, grouping, and all standard flags (global, case-insensitive, multiline, unicode, dotAll, sticky). Advanced features include lookarounds, named groups, and backreferences.
The tool provides instant pattern validation, live match highlighting, syntax error detection, performance metrics, and detailed debugging information including match groups, capture analysis, and pattern explanations with visual feedback.
Our pattern library includes validation patterns (email, phone, URL), extraction patterns (dates, numbers, text), processing patterns (HTML, code, formatting), and specialized patterns for web development, data science, and system administration.
All regex testing happens locally in your browser with no data transmission to servers. Your patterns, test strings, and sensitive data remain completely private and secure throughout the testing process, suitable for confidential development environments.
Explore more developer and code tools