Regular Expression Tester

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Test, debug, and learn regular expressions instantly. Live matching, detailed explanation, and a library of common patterns.

Regular Expression

0 chars

Test Strings

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Match Results

0 matches

Enter a regex and test strings to see match results

Regex Explanation

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Quick Reference

. Any character
\d Digit
\w Word character
\s Whitespace
^ Start of string
$ End of string
* 0 or more
+ 1 or more

Common Patterns

Regex Tips

  • Use ^ and $ for exact matches
  • Escape special characters with \
  • Use groups () for capturing
  • Test with various input cases

Features

  • Real-time regex testing
  • Detailed regex explanation
  • Common patterns library
  • Multiple regex flags
`; break; } document.getElementById('regexInput').value = regex; document.getElementById('testStrings').value = testStrings; document.getElementById('regexInput').dispatchEvent(new Event('input')); document.getElementById('testStrings').dispatchEvent(new Event('input')); } function loadPattern(type) { let regex = ''; switch(type) { case 'email': regex = '^[^\\s@]+@[^\\s@]+\\.[^\\s@]+$'; break; case 'url': regex = 'https?://[^\\s/$.?#].[^\\s]*'; break; case 'phone': regex = '\\(\\d{3}\\) \\d{3}-\\d{4}'; break; } document.getElementById('regexInput').value = regex; document.getElementById('regexInput').dispatchEvent(new Event('input')); }