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External Data Source

Source

Regular Expression
^((0?[1-9]|1[012])(\s*:\s*([0-5]\d))?(\s*:\s*([0-5]\d))?(\s*([AaPp])[Mm]?)$|(2[0-3]|[1]\d|0?\d)(\s*:\s*([0-5]\d))(\s*:\s*([0-5]\d))?)$