Question

I have been struggling with this for a couple days now and cannot seem to figure it out.

I have an array of email addresses that were created via push(@emails,$email) in a while loop.

I am attempting to create a list of unique domains with occurrence count of each in the array.

Ordered by number of occurrences.

So, if the array @emails has:

[e-mail] [e-mail] [e-mail] [e-mail]

I can print:

yadoo.com 2
geemail.net 1
zoohoo.org 1

I found this example based on emails in a file but, WAY over my head. Can someone help me in a more verbose code example that can be used with an array of email addresses?

perl -e 'while(<>){chomp;/^[^@]+@([^@]+)$/;$h{$1}++;}
foreach $k (sort { $h{$b} <=> $h{$a} } keys %h)  {print $h{$k}." ".$k."\n";} infile

I also tried: (more to my level of lack of understanding)

foreach my $domain (sort keys %$domains) {
  print "$domain"."=";
  print $domains->{$domain}."\n";
};

AND

my %countdoms;
$countdoms{$_}++ for @domains;
print "$_ $countdoms{$_}\n" for keys %countdoms;

The best result I got of many different attempts was a total count (which was 1812 (accurate count) with a number 2 next to it. I am close, possibly?

Answer 1

If you have your email address populated in an array this’ll get you a count for each domain. I’m sure someone can produce something prettier!

my @emails = ('[e-mail]','[e-mail]','[e-mail]','[e-mail]');

my %domainCount;

foreach(@emails){
    if ($_ =~ /@(\w+.*)/){
        $domainCount{$1}++;
    }
}

for my $domain (sort { $domainCount{$b} <=> $domainCount{$a}} keys %domainCount ){
    print "$domain - $domainCount{$domain}\n";
}