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/^
                (([12][\d])?[\d]{2})?
                (
                    (0[1-9]|1[0-2])
                    (0[1-9]|[12][0-9]|3[01])
                    ([01][0-9]|2[0-4])
                    ([0-5][\d]|60)
                ){1}
                (.([0-5][\d]|60))?
                $/