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Letter Types

Generator

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Regex Tester & Debugger

Test regular expressions in real-time. Match patterns, extract data, and validate with instant visual feedback.

//g

Quick Reference

Character Classes

. - Any character except newline
\d - Digit (0-9)
\w - Word character (a-z, A-Z, 0-9, _)
\s - Whitespace
[abc] - Any of a, b, or c
[^abc] - Not a, b, or c

Quantifiers

* - 0 or more
+ - 1 or more
? - 0 or 1
{n} - Exactly n
{n,} - n or more
{n,m} - Between n and m

Common Patterns

Pro Tips

  • Use groups () to capture parts
  • Test with edge cases
  • Start simple, add complexity
  • Use online regex101 for details
  • Escape special characters