gistfile1.js

String.prototype.fulltrim = function(){
    return this.replace(/(?:((?:^|\n)(?:\s|,|\.|!)+)|((?:\s|,|\.|!)+(?:$|\n)))/g,'');
};

Parse.Cloud.beforeSave("Ad", function(request, response) {
                       var itemDesc = request.object.get("itemDesc");
                       request.object.set("itemDesc", itemDesc.fulltrim());
                       response.success();  
                       });