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Regex Tester
Test and debug regular expressions online with real-time matching. Support for multiple regex flavors and explanation mode.
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About Regex Tester
Test and debug regular expressions in real-time. See matches highlighted, capture groups, and explanations. Essential for developers working with text patterns.
Use Cases
Testing regex patterns before coding
Debugging complex expressions
Learning regular expressions
Validating pattern matches
Extracting data from text
How to use
1
Enter your regex pattern
2
Paste test text below
3
See matches highlighted
4
View capture groups and details
Pro Tips
- Use flags: g (global), i (case-insensitive), m (multiline)
- Test with edge cases
- Start simple and build complexity
Frequently Asked Questions
Regular Expression - a pattern language for matching text.
Check flags, escaping special characters, and pattern logic.
Parentheses () capture part of the match for extraction.