🔍 Regex Tester
Test and debug regular expressions with live matching and detailed explanations.
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Common Regex Patterns
\d- Digit (0-9)\w- Word character (a-z, A-Z, 0-9, _)\s- Whitespace.- Any character except newline[a-z]- Any lowercase letter[A-Z]- Any uppercase letter[0-9]- Any digit
Quantifiers
*- 0 or more+- 1 or more?- 0 or 1{n}- Exactly n times{n,}- n or more times{n,m}- Between n and m times
Anchors
^- Start of string$- End of string\b- Word boundary
💡 Regex Tips
- Use non-greedy quantifiers (
*?,+?) when appropriate - Prefer specific character classes (
\d) over generic ones (.) - Use online regex testers to validate patterns across languages
- Comment complex regexes using the
(?#comment)syntax - Test with edge cases to ensure pattern robustness