Regular Expression Tester
Test and debug regular expressions with real-time matching. Perfect for developers working with pattern matching and text processing.
Enter test string to see matches...
Common Patterns
Quick Reference
. - Any character* - Zero or more+ - One or more? - Zero or one^ - Start of string$ - End of string[abc] - Character class\d - Digit\w - Word character\s - WhitespaceRegex Uses
- • Validation: Email, phone, credit cards
- • Extraction: URLs, dates, phone numbers
- • Search & Replace: Text processing
- • Parsing: Log files, data formats
- • Form Validation: User input checking
Tips & Best Practices
- • Test with various inputs, including edge cases
- • Use non-capturing groups (?:) for performance
- • Be specific to avoid false positives
- • Use anchors (^ and $) when needed
- • Consider regex performance for large texts
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