contains all characters except those below:
\\the literal \ (9210 / 1348 / 5C16)
xthe literal x (12010 / 1708 / 7816) (case sensitive)
0the literal 0 (4810 / 608 / 3016)
0-\\one character from 0 (4810) to \ (9210)
xthe literal x (12010 / 1708 / 7816) (case sensitive)
7the literal 7 (5510 / 678 / 3716)
Fthe literal F (7010 / 1068 / 4616) (case sensitive)