?matches at most one character from the set below:
+the literal + (4310 / 538 / 2B16)
-the literal - (4510 / 558 / 2D16)
\d*a digit, repeated any number of times
\.?optionally matches the literal . (4610 / 568 / 2E16)
\d+a digit, repeated at least once
Non-Capturing Group(?:e[+-]?\d+)? ?repeats the group contents below at most once:
ethe literal e (10110 / 1458 / 6516) (case insensitive)
?matches at most one character from the set below:
+the literal + (4310 / 538 / 2B16)
-the literal - (4510 / 558 / 2D16)
\d+a digit, repeated at least once