Wow, thanks! As I can see, you guys got interested on sorting out the optimum solution for this problem!
So what I did: I read the posts, each one scarier than the previous; I know Excel is very rich and complex, but the more I read the less I know :P. So I tried working on the first post by Martin. And, with few adjustments, I got what I wanted accomplished! Thanks to you. Fantastic was this approach...
=LEN(SUBSTITUTE(C4;AL2;"^^"))-LEN(C4) (cells addresses may vary)
That was what I found hard to elaborate before coming here since I didn't know most of those functions. Then I opened the help file and walked through some of them.

Thanks!