Verify that a code (such as invoice or others) is as it should be

Verify character by character. The invoice code must be a string.

As for example

As-5b-3c-hd    (asi deveria ser) 
5g-op7-#;jdj.    ( este el incorrecto)

1.control the "-" between each 2 characters The characters in the middle of the "-" are not if they are number or letters