var pattern = new RegExp('^(ftp|http|https):?'+ // protocol
                                                                     '((([a-z\\d]([a-z\\d-]*[a-z\\d])*)\\.?)+[a-z]{2,}|'+ // domain name
                                                                     '((\\d{1,3}\\.){3}\\d{1,3}))'+ // OR ip (v4) address
                                                                     '(\\:\\d+)?(\\/[-a-z\\d%_.~+]*)*'+ // port and path
                                                                     '(\\?[;&a-z\\d%_.~+=-]*)?'+ // query string
                                                                     '(\\#[-a-z\\d_]*)?$','i');
                                             res = element.url_field.substr(0,8);
                                             if(!pattern.test(element.url_field)) {
                                                window.alert("Please enter a valid URL.");
                                              }else if(res != "https://"){
                                                element.url_field = "https://" + element.url_field;
                                              }
                                                url_inputs.push(element.url_field);