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^(?'Preamble'.*?)((?'NationalTrack'\d{4})-)?(?'Distance'(?'MetricDistance'(?'KmThousands'[A-Z])?(?'Km'\d{3})(?'Meters'\d{3}))|(?'ImperialDistance'(?'Miles'\d{3})(?'Chains'\d{2})(?'Yards'[0A-V])))(?'LocalTrack'[A-T])(?'Unit'[MK])(\s*\((?'Iteration'\d+)\)\s*)?.SC[NPX0-9]$
/
gm