Monks of Wisdom,

So, after a bit of a break from this to do other work, I'm trying (once again) to resolve the previous issues and now I am seeing some warnings in my output. To my beginners eyes it appears there may a Case issue. I noticed the only difference between the output line that matches and the ones that fail is that the match portion are all numbers. Futhermore, when I checked the data files I noticed the input search strings are in lowercase and the oui strings to match against are in UPPERCASE. Currently using oko1's version of code (shown below) for simplicity. THANKS!

#!/usr/bin/perl -w
use 5.010;
use strict;

my %oui;
open my $list1, "ouisample.txt" or die "ouisample.txt: $!\n";
while (<$list1>){
  if (/^(.*?) {5}\(base 16\)\t\t(.*)$/) {
     $oui{$1} = $2;
  }
}
close $list1;

while (<>){
    if (/((?:\d+\.){3}\d+).*([\w.]{14})/i){
        (my $temp = $2) =~ tr/.//d;
        print "$1 mapped to $temp for company ", $oui{substr $temp, 0,
+ 6}, "\n";
    }
}
[download]

I updated one line and got it to work finally!

(my $temp = uc($2)) =~ tr/.//d;
[download]

Thanks a bunch, I'm so excited the script finally works as hoped.