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"(?<!\d) (?: (?!0000)[0-9]{4} (?P<sep1>[-/.])? (?: (?:(?(sep1)0?|0)[1-9]|1[0-2]) (?P=sep1) (?:(?(sep1)0?|0)[1-9]|1[0-9]|2[0-8]) |(?:(?(sep1)0?|0)[13-9]|1[0-2]) (?P=sep1) (?:29|30) |(?:(?(sep1)0?|0)[13578]|1[02]) (?P=sep1) (?:31) ) | (?: [0-9]{2} (?: 0[48] |[2468][048] |[13579][26] ) |(?: 0[48] |[2468][048] |[13579][26] )00 ) (?P<sep2>[-/.]?) (?(sep2)0?|0)2 (?P=sep2) (?:29) ) (?!\d) "gmxPython+07 years ago✓ Pre-loaded

About this regex

Matches valid dates in YYYY-MM-DD, YYYY/MM/DD, YYYY.MM.DD, or YYYYMMDD formats. It enforces correct days per month, handles leap years accurately for February 29th, and allows optional leading zeros on single-digit months/days when separators are used.

date validation leap-year datetime python

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About this regex

date validation leap-year datetime python

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