?matches at most one character from the set below:
-the literal - (4510 / 558 / 2D16)
+the literal + (4310 / 538 / 2B16)
\d*a Unicode decimal digit, repeated any number of times
\.?optionally matches the literal . (4610 / 568 / 2E16)
\d+a Unicode decimal digit, repeated at least once
g modifier: global. Finds all matches instead of stopping after the first