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External Data Source

Source

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