Regex Editor & Tester

Validates dates in yyyy/mm/dd format for years 1000-9999, enforcing correct day ranges per month (31 days for Jan/Mar/May/Jul/Aug/Oct/Dec, 30 for Apr/Jun/Sep/Nov, 28 for Feb). It also handles leap years, permitting Feb 29 only in years divisible by 4, excluding centuries not divisible by 400. Useful for strict date validation in form inputs or log parsing.