*repeats the group contents below any number of times:
the literal (3210 / 408 / 2016)
+the literal + (4310 / 538 / 2B16)
-the literal - (4510 / 558 / 2D16)
the literal (3210 / 408 / 2016)
\d{0,}a digit, repeated any number of times
Non-Capturing Group(?:[a-z](?:\^\d+)?)? ?repeats the group contents below at most once:
a-zone character from a (9710) to z (12210) (case sensitive)
Non-Capturing Group(?:\^\d+)? ?repeats the group contents below at most once:
\^the literal ^ (9410 / 1368 / 5E16)
\d+a digit, repeated at least once