?repeats the group contents below at most once:
\+?optionally matches the literal + (4310 / 538 / 2B16)
\d+a digit, repeated at least once
Non-Capturing Group(?:\h+\d+)* *repeats the group contents below any number of times:
\h+any horizontal whitespace character, repeated at least once
\d+a digit, repeated at least once
,the literal , (4410 / 548 / 2C16)
\h*any horizontal whitespace character, repeated any number of times