Your question was answered, but man that was a terrible title you chose. Just really awful.

What you chose: "problem with perl 5" says absolutely nothing about the problem you actually have. It says "I don't like Perl 5" and you don't even realize it. Sure, the rest of us do and we correct your mistakes for you but don't you wish you could communicate more effectively in your life?

Next time, consider explaining your actual problem -- which was that your regex works in one VERSION of Perl but not another. For example, "Regex works in Perl5.14 but not Perl5.10"

After all, isn't your labor supposed to be cheaper than mine? Now we know ...