This is a good place for map: 
use warnings;
use strict;
my $str  = 'abcdefghijklmnopqrstuvwxyz';
my $size = 10;
my @subs = map substr($str, $_*$size, $size), 0..(length($str)-1)/$siz
+e;
print join("\n", @subs), "\n";

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In reply to Re^2: Eliminating substr warnings by Roy Johnson
in thread Eliminating substr warnings by ezekiel

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