Hey! I've got a little problem I have no idea where to begin with.
I've got a string and I need to check the insides of it. The string should be formatted like <letter><number>, for example "A1" or "F4". The letters can only be from A to F and numbers from 1 to 4. So... How is the checking done? I thought I should start with checking if the string is just two characters long, then tokenize the characters for per-character checking. But, the actual check-code isn't clear. :)