At least part of your problem seems to be with
while (defined(<>)).
The
<> takes a line from the filehandle,
and then you test it for being
defined, and (continue to) loop if it is. Unfortunatly, unlike using
while(<>) it doesn't actually assign the value into
$_. To do that you can use
while (defined($_=<>)), but that's exactly equivilent to
while(<>).
I would advise that you look at using split, instead of regex for this task. It looks like it probably would be better suited for this data.
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