Others have already commented on your code. I want to comment on your final "wibble".

I think on PerlMonks, there is no such thing as a question that is too basic. People here are generally very eager to help even absolute newbies. What will displease senior monks and junior monks alike is questions that make clear that the author didn't care to do any research on their own, or does not want to learn, but just wants his or her current problem solved.

However, your post shows that you have put some thought into your question before stating it, even if it is basic, and that you are eager to learn. So don't be fearful to ask more basic questions, you are welcome!

Another aspect of "basic" questions is that a lot of them are not basic at all. They might touch on a hidden aspect of perl that many people are not aware of, and thus be much more edifying than you imagine.