Hi cdarke, I tried with

for my $pattern (@array2) {
    my @results = grep /$pattern/, @array1;
    print "$pattern is in @results\n";
}
[download]

But i still have some error.e.g. it shows 2 outputs for some strings

abc_RCF_BM_allocation_0_kl contains BM_allocation_0
abc_RCF_BM_allocation_0_kl contains RCF_BM_allocation_0
aplc_RCF_BM_allocation_0_in_nml contains RCF_BM_allocation_0_in
aplc_RCF_BM_allocation_0_in_nml contains BM_allocation_0
[download]

Still i didnt get what could be the problem.