foreach my $actual_path_to_check (keys(%{$virtual_paths_href})) {
    foreach my $current_actual_path (keys(%{$virtual_paths_href})) {
        next if ($actual_path_to_check eq $current_actual_path);
        if ($virtual_paths_href->{$current_actual_path} =~ /^$virtual_paths_href->{$actual_path_to_check}/) {
            # Replace
        }
    }
}