in reply to
Re^2: handling files using regular expression
in thread handling files using regular expression
Firstly, when posting asking for help please post the actual code you're running. This code differs significantly from the code you have initially provided. Also, the advice in the post I linked to wasn't restricted to adding use strict; use warnings;, we also told you to use open properly, and to check for errors.
Here you have two while loops for some reason, I've no idea why. Also you're splitting on tab but to one variable, and the input data you provide doesn't have any tabs at all.
I'd suggest (again) that you take the time to learn the basics, and if you're going to ask for advice which you claim resolves your poroblem please either try and remember it or keep notes so that you use apply the same knowledge in future works.