Hi

I have to read Barcode.
I have to get 10 character with the following format 123456-789 (6 digits, dash +3 digits) .
My clients use with few bar readers that each one retrieve the results, but adding different characters for safe.

for example:
*123456-789*
c123456-789c
*c123456-789c*
***123456-789***
123456-789

I want to get always the 10 center characters.
In addition, I want to be sure that all the rest not digits (how to run isdigit function).