{2,}repeats the group contents below at least 2 times:
,the literal , (4410 / 548 / 2C16)
\s*any whitespace character, repeated any number of times
?matches at most one character from the set below:
-the literal - (4510 / 558 / 2D16)
+the literal + (4310 / 538 / 2B16)
Group 12([1-8]?\d(\.\d+)?|90(\.0+)?) 1st Alternative[1-8]?\d(\.\d+)? ,the literal , (4410 / 548 / 2C16)
\s*any whitespace character, repeated any number of times
Group 15(180(\.0+)?|((1[0-7]\d)|([1-9]?\d))(\.\d+)?)