?repeats the group contents below at most once:
the literal (3210 / 408 / 2016)
\(the literal ( (4010 / 508 / 2816)
Group height_cm(?P<height_cm>\d+) \d+a Unicode decimal digit, repeated at least once
Non-Capturing Group(?:\s?cm) \s?optionally matches a Unicode whitespace character
cmthe literal text cm (case sensitive) \)the literal ) (4110 / 518 / 2916)