Splitting can be done in other ways than using split. Here it is by far easier to describe the pieces that should result from the splitting and use a regex (a simple regex, relatively simple regex):

use strict;
use warnings;

my $to_split = "'A','B','C','D','E','F','G','H','I','J','K','L','M','N
+','O','P','Q','R','S','T','U','V','W','X','Y','Z'";
my @pieces = $to_split =~ /('\w'(?:,'\w'){0,4})/g;
$"="\n";
print "@pieces\n";
[download]

Or, if you insist on split, use the above as a delimiter, and remove the commas:

use strict;
use warnings;

my $to_split = "'A','B','C','D','E','F','G','H','I','J','K','L','M','N
+','O','P','Q','R','S','T','U','V','W','X','Y','Z'";
my @pieces = grep {$_} split /('\w'(?:,'\w'){0,4}),?/, $to_split;
$"="\n";
print "@pieces\n";
[download]

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