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 - Whitespace

Regex 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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