Odd length is only a problem if you have to change the last character. For this case we can use: 
use strict;
use warnings;
my $string = 'athis';
print $string =~ s/(.)(.)/$1.uc$2/egr;

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Bill

In reply to Re^3: Print the string out in alternating upper and lowercase letters LiKe tHiS. by BillKSmith
in thread Print the string out in alternating upper and lowercase letters LiKe tHiS. by Anonymous Monk

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