+matches at least one character from the set below:
A-Zone character from A (6510) to Z (9010) (case sensitive)
a-zone character from a (9710) to z (12210) (case sensitive)
0-9one character from 0 (4810) to 9 (5710)
\sany whitespace character
\'the literal ' (3910 / 478 / 2716)
=the literal = (6110 / 758 / 3D16)