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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)(?:jan|mar|may|jul|aug|oct|dec))(?(thirty)(?:jan|mar|apr|may|jun|jul|aug|sep|oct|nov|dec))(?(twonine)(?:jan|(?P<feb>feb)|mar|apr|may|jun|jul|aug|sep|oct|nov|dec|))(?(twoeight)(?:jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec)))(?P=sep)(?P<year>(?:\d\d)?(?(twonine)(?(feb)(?:(?:[02468][048])|(?:[13579][26]))|(?:\d\d))))(?:$|\s)