>You might want to be careful with this if there is a possiblity of Asian-language text (e.g. Chinese, Japanese, Korean) which use double-byte character sequences.
>
>You probably also want to include the chr(9) (horizontal tab) as one of the valid characters.

Asian or other non US character data will not be an issue here (at least not in the forseeable future).

The horizontal tab is a good idea. I will add that to the set of acceptable characters.

Thanks!