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External Data Source

Source

Regular Expression
^[1-4]\d{3}\/((0[1-6]\/((3[0-1])|([1-2][0-9])|(0[1-9])))|([1-6]\/((3[0-1])|([1-2][0-9])|(0[1-9])))|((1[0-2]|(0[7-9])|([1-9])|(0[1-9]))\/(30|([1-2][0-9])|(0[1-9])|([1-9]))))$