Regex Tester & Validator
Test, validate and match regular expressions
Test, validate and match regular expressions
Validates ISO 8601 date and time formats, supporting year-only dates, year-month, calendar dates (YYYY-MM-DD), week dates (YYYY-Www-D), and ordinal dates (YYYY-DDD). It also optionally matches time components including hours, minutes, seconds with decimal fractions, and timezone offsets (Z or ±HH:MM). The pattern enforces correct ranges for each component (e.g., months 01-12, days 01-31) and ensures consistent date separators using backreferences.