Regex Tester
Test and debug regular expressions with real-time matching and highlighting. Validate patterns and extract matches.
How to Use
- • Enter your regular expression pattern in the first field
- • Select the flags you want to use (global, case-insensitive, etc.)
- • Enter the text you want to test in the test string field
- • Matches will be highlighted in yellow in the test string
- • View detailed match information including index and groups
- • Invalid patterns will show error messages
Regular expressions (regex) are powerful pattern-matching tools used in programming to search, match, and manipulate text. Our regex tester provides a real-time environment for developing, testing, and debugging regular expressions with instant visual feedback.
Whether you're validating user input, parsing log files, or extracting data from strings, regular expressions help match and manipulate text patterns. This tool supports standard JavaScript regex syntax and provides detailed match information including positions, groups, and flags.
All regex testing happens entirely in your browser, ensuring your patterns and test strings remain private and secure. The tool highlights all matches in real-time, making it easy to understand what your regex is matching and adjust patterns accordingly.
- • Input Validation: Test regex patterns for validating email addresses, phone numbers, or other formats
- • Text Processing: Develop patterns for extracting or replacing text in strings
- • Log Analysis: Create patterns to parse and extract information from log files
- • Data Extraction: Test patterns for extracting structured data from unstructured text
- • Learning: Experiment with regex syntax and understand how different patterns work