my @invoicing_list = split( /\s*\,\s*/, $signup_data->{'invoicing_list'} );
$signup_data->{'pkgpart'} =~ /^(\d+)$/ or '' =~ /^()$/;
my @invoicing_list = split( /\s*\,\s*/, $signup_data->{'invoicing_list'} );
$signup_data->{'pkgpart'} =~ /^(\d+)$/ or '' =~ /^()$/;