#!/usr/bin/env perl 
use strict;
use warnings;

my $data = <<EOT;
hostname
banner exec
EOT

my $search = <<EOT;
hostname XXXXX
banner exec ******************************************************************************
banner exec</>
banner exec This device belongs to the
EOT

for my $substr (split /\n/, $data) {
	for my $line (split /\n/, $search) {
		print "Matched '$substr' in '$line'\n" if index ($line, $substr) > -1;
	}
}