HI - I'd like to make validation through code. However, the cells are
textual, not numeric. For instance, the cells in the range must only
hold a single zero 0 or any 3-digit combination of numbers from 1
through 4, such as 111, 234, 420, 444. Anything like 454, 12345,
4444, etc. must be caught. Any help on this would be greatly
appreciated.

Also, it would be great if the code auto corrected a user's mistake.
If someone entered a 2222, Excel would correct it to 222; if someone
entered 434444, Excel would take of the trailing 4s and make it 434.

Thanks again