I often use plussed addresses (andrew+spam@afresh1.com as an example) and I wanted to get an idea on what addresses have received mail. I have addresses at several domains that end up in this mailbox, all ascii domains, thus the [-a-z0-9\.]+.

This is just throwaway code that looks through my email (in Maildir format), but wanted some monk wisdom on what I didn't think of that could make it faster. My assumption is that faster disks would be the biggest improvement, but what could I do for free?

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

use File::Find;
use YAML::Syck;

my %addresses;

find(sub {
    return unless -f $_;

    open my $fh, '<', $_ or die;
    while (<$fh>) {
        last if $_ eq "\n"; # only scan headers
        $_ = lc $_;

        if (/\b(andrew\+[^\@\s]+\@[-a-z0-9\.]+)\b/xms) {
            my $addr = $1;
            # some addresses are in mailing list bounce format
            if ($addr =~ s/[=\#\%](?:3d)?/@/xms) {
                $addr =~ s/\@[^@]+$//xms;
            }
            $addresses{$addr}++;
        }

    }
    close $fh;

}, glob($ENV{HOME} . '/Maildir/.misc*'));

print Dump \%addresses;

[download]
l8rZ,
--
andrew

In reply to Looking for ideas on how to optimize this specialized grep by afresh1

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