Regex Cheatsheet - Regular Expression Quick Reference
Quick reference for regular expression patterns. Character classes, quantifiers, anchors, and common patterns.
Date Pattern (YYYY-MM-DD)
Common PatternMatch ISO date format YYYY-MM-DD
Pattern
^\d{4}-(0[1-9]|1[0-2])-(0[1-9]|[12]\d|3[01])$Syntax
Explanation
Strictly validates year-month-day ranges. Months 01-12, days 01-31 (simplified).
Examples
2024-01-15Standard date
Matches: 2024-01-15
2024-12-31Year-end date
Matches: 2024-12-31
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