No PO Boxes in Shipment Address Magento 1.9 - part 5

Validation.add('validate-for-pobox','The shipping address must be a physical address. PO Boxes are allowed for billing only.',function(field_value) {
    // setup a regex var for pretty much every possibility of PO box...
    var regex = /[P|p]*(OST|ost)*\.*\s*[O|o|0]*(ffice|FFICE)*\.*\s*[B|b][O|o|0][X|x]/;
    // if the field_value contains PO Box
    if(field_value.match(regex)){
        return false;
    }
    return true;
});