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Matches dates in YYYY-M-D, YYYY/M/D, or YYYY.M.D formats without leading zeros on month/day. Captures a named 'date' group containing the full date. Validates years 1900-2099, months 1-12, and days 1-31 (though it won't reject invalid day-month combinations like Feb 30). Useful for parsing user-friendly date strings in logs or input forms.