Have you taken a look at what is on CPAN?

I know nothing of this, but simply did a search for "CPAN panindrome" and came up with:

• This

and

• Another(applicable?)

If the output is unclear, clarify it. (Is this your code?). I agree with the previous response in getting rid of the 'goto'.
Other than that, if it works... .

Honestly, unless this is a code writing exercise, I would look for something already written and freely available. Even if it is an
exercise in code writing, look at what has been written and use that as an example.

Hope that is helpful...