?repeats the group contents below at most once:
\s*any whitespace character, repeated any number of times
Non-Capturing Group(?:to|\p{Pd}) tothe literal text to (case sensitive) \p{Pd}a dash or hyphen punctuation mark
\s*any whitespace character, repeated any number of times
\d*a digit, repeated any number of times
\.?optionally matches the literal . (4610 / 568 / 2E16)
\d+a digit, repeated at least once