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External Data Source

Source

Regular Expression
(^([1-9]|[1][0-2]):([0-5][0-9])(\s{0,1})(AM|PM|am|pm|aM|Am|pM|Pm{2,2})$)|(^([0-9]|[1][0-9]|[2][0-3]):([0-5][0-9])$)|(^([1-9]|[1][0-2])(\s{0,1})(AM|PM|am|pm|aM|Am|pM|Pm{2,2})$)|(^([0-9]|[1][0-9]|[2][0-3])$)