Regex Cheatsheet - Regular Expression Quick Reference
Quick reference for regular expression patterns. Character classes, quantifiers, anchors, and common patterns.
Credit Card Pattern
Common PatternMatch credit card number (16 digits, optional separators)
Pattern
\d{4}[-\s]?\d{4}[-\s]?\d{4}[-\s]?\d{4}Examples
1234-5678-9012-3456Card with hyphens
Matches: 1234-5678-9012-3456
1234567890123456Plain digit card
Matches: 1234567890123456
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