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

my @left_text   = qw{ when rome romans};
my $right_text  = 'When in Rome, Romans do as the Romans do in Rome.';

my $count = '0';
for my $search_text (@left_text) {
	if ($right_text =~ /\Q$search_text\E/i) {
		$count++
	}
}
print "Found = $count\n";
__END__
Found = 3