I think you meant substr($data,0,8,'') .. otherwise $data doesn't get modified and it'll be an infinite loop :)
Note that re: your #1, $data is also logically false if it is an empty string '' or undef (see True or False? A Quick Reference Guide for a good reference)
As for an alternative, you could also use a regex (there's probably a split solution as well--this is close: my @pieces = split /(.{1,3})/, $x):
my @pieces = $data =~ /(.{1,8})/g;
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