What Is Regex Tester?

Regex Tester is an online tool for testing and debugging regular expressions (regex). It provides instant feedback with match highlighting, shows capture groups, and helps you understand how your regex pattern works.

How To Use This Regex Tester

1. Enter your regular expression pattern
2. Add test text to match against
3. Select regex flags (global, case-insensitive, multiline)
4. See matches highlighted in real-time
5. View capture groups and named groups
6. Test and refine your pattern

Key Features

• Real-time regex matching
• Match highlighting
• Capture group visualization
• Support for all regex flags
• Error detection and messages
• Match statistics and count
• Regex explanation and tips

Who Can Use This Tool?

• Developers writing regex patterns
• Data scientists parsing text data
• QA engineers testing validation rules
• System administrators writing scripts
• Students learning regular expressions

Common Use Cases

• Testing form validation patterns
• Debugging complex regex expressions
• Extracting data from text
• Validating email and URL formats
• Parsing log files
• Text search and replace operations
• Learning regex syntax