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External Data Source

Source

Regular Expression
(?:\s|^)(?P<day>(?P<threeone>31)|(?P<thirty>30)|(?P<twonine>29)|(?P<twoeight>2[0-8]|1[0-9]|0?[1-9]))(?P<sep>[/\-\.:])(?P<month>(?(threeone)(?:1[02]|0?[13578]))(?(thirty)(?:1[012]|0?[13456789]))(?(twonine)(?:1[012]|0?[13-9]|(?P<leap>0?2)))(?(twoeight)(?:1[012]|0?[1-9])))(?P=sep)(?P<year>(?:\d\d)?(?(leap)(?:(?:[02468][048])|(?:[13579][26]))|(?:\d\d)))(?:$|\s)