There is nothing much wrong with the code you have posted (with the provisos mentioned below) but the problem appears to be in the pattern(s) in your if statement. The error message indicates that you are using some undefined variable in one or other of the pattern matches in that statement. However, you don't have any variables within the patterns shown--perhaps you should post the actual code?
A couple of other comments: please put your code in <code> tags--this would make it much more readable. You would probably be better to use lexical (my) rather than package (our) variables in your use case. Finally, you are missing a terminating "/" in the first pattern match, presumably because you have retyped a shortened version of your code. There is nothing wrong with showing PerlMonks a shortened version of your code--in fact it is encouraged--but it needs to be runnable, and demonstrate the bug.
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