Looking at some of the code you have published on PerlMonks I notice that your indentation and coding style can be a bit mixed. Using consistent indentation and coding style makes it harder to mismatch paired constructs and makes it easier to find errors when you do manage to get it wrong.

Decent editors allow you to jump between matching parentheses, brackets and so on. With consistent indentation you can work through blocks in your code jumping between brackets until you find an indentation mismatch.