-?optionally matches the literal - (4510 / 558 / 2D16)
\d{1,2}a Unicode decimal digit, repeated between 1 and 2 times
?repeats the group contents below at most once:
\.the literal . (4610 / 568 / 2E16)
\d+a Unicode decimal digit, repeated at least once
Positive Lookahead(?=\s*,?\s*) \s*a Unicode whitespace character, repeated any number of times
,?optionally matches the literal , (4410 / 548 / 2C16)
\s*a Unicode whitespace character, repeated any number of times
+matches at least one character from the set below:
\sa Unicode whitespace character
,the literal , (4410 / 548 / 2C16)
-?optionally matches the literal - (4510 / 558 / 2D16)
\d{1,3}a Unicode decimal digit, repeated between 1 and 3 times
?repeats the group contents below at most once:
\.the literal . (4610 / 568 / 2E16)
\d+a Unicode decimal digit, repeated at least once