Why not just use two single quotes?

^ [ a - z A - Z 0 - 9 \ s , / \ - _ @ # : ( ' ' ) ] + $

EDIT: Nevermind, just payed a little attention and realized that was a character class. What are you trying to do anyways, match non-printable characters and single quotes? That regex excludes almost everything else. There may be an easier way.

-Mike