Hello, I have to clean up a database that might contain characters with text not compliant to an old application.

Permitted text is:
A-Z (capitals and small letters),
0-9,
. (dot),
, (comma),
- (dash),
(space)

OBJECTIVE: If a cell contains characters other than those, excel should return an information stating this (no need to specify which position the error is at). A simple message is enough.

I would need this as a formula in some way, or a macro that will automatically run without manual input such as clicking on a button or so...

Is this feasible and if, could you let me know how I can accomplish this?
The field length is usually 128 characters.

I thank you all and know, that if nobody can answer me here, it probably can't be done (which I doubt ;-)

Thanks!!!

Titus.