Cool. This required a nice enhancement to Data::Diver. Thanks.

#!/usr/bin/perl -w
use strict;
use Data::Diver 1.01 qw( DiveVal );

my @filenames = <DATA>;
chomp @filenames;

my $files = { };

foreach my $file (  @filenames  ) {
    print "processing file: $file\n";
    my @parts= split /[-_.]/, $file;
    DiveVal( $files, \(@parts) )= 1;
}
__DATA__
0001-test-thing.sgi
1.tif
10.tif
2.tif
final-0002.tif
final-0003.tif
final-0004.tif
final-0001.tif
[download]

Sorry, the new version of the module will take a few hours / days to get to all the CPAN mirrors.