I think you may have an X-Y problem here.
Guessing what your underlying problem is you probably don't want these arrays at all. You can simply look for lines that match /^[[:upper:]]+$/.
use strict;
use warnings;
use Data::Dumper;
my %rules;
{
my $r = \my @uncategorised;
local *_;
while(<DATA>) {
if ( /^[[:upper:]]+$/ ) {
$r = \@{$rules{$_}};
} else {
push @$r => $_;
}
}
}
print Dumper \%rules;
__DATA__
INPUT
-p tcp -s 10.0.12.1 -j ACCEPT
FORWARD
-p udp -d 10.0.12.4 -j ACCEPT
OUTPUT
-p tcp -s 10.0..12.5 -j ACCEPT
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