+matches at least one character from the set below:
a-zone character from a (9710) to z (12210) (case sensitive)
A-Zone character from A (6510) to Z (9010) (case sensitive)
0-9one character from 0 (4810) to 9 (5710)
\\the literal \ (9210 / 1348 / 5C16)
.the literal . (4610 / 568 / 2E16)
\\-_one character from \ (9210) to _ (9510)