Kendo UI input 正则表达式验证

<input type="text" pattern="[A-Z0-9_]{4}" class="k-input k-textbox" name="userId" required="required" data-bind="value:userId" data-required-msg="{{UserId}}{{required}}" validationMessage="编码字符只能是大写字母，数值或下滑线中的字符！" >


1.pattern="[A-Z0-9_]{4}"
2.validationMessage="编码字符只能是大写字母，数值或下滑线中的字符！"


另外一种：

$scope.dataSource = new kendo.data.DataSource({
          batch: true,
          transport: {
            read: {
                url: $rootScope.serviceRoot+"/user/read",
                dataType: "json",
                type: "POST",
                contentType: "application/json"
            },
            create: {
                url: $rootScope.serviceRoot+"/user/create",
                dataType: "json",
                type: "POST",
                contentType: "application/json"
            },
            update: {
                url: $rootScope.serviceRoot+"/user/update",
                dataType: "json",
                type: "POST",
                contentType: "application/json"
            },
            destroy: {
                url: $rootScope.serviceRoot+"/user/destroy",
                dataType: "json",
                type: "POST",
                contentType: "application/json"
            },
            parameterMap:function(options, operation) {

                if (operation !== "read" && options.models) {
                  //console.log("options.models:")
                  //console.log(options.models);

                  return JSON.stringify(options.models[0]);
                  //  return {models:                 kendo.stringify(options.models)};
                }

            }
          },
          schema: {
            model: {
                id: "id",
                fields: {
                    id: { from: "id", type: "number" },
                    userId: { from: "userId",
                              validation:
                              {
                                required: true,
                                useridvalidation: function (input) {
                                                    if (input.is("[name='userId']") && input.val() != "") {
                                                        input.attr("data-useridvalidation-msg", "编码字符只能是字母，数值或下                                                           滑线中的5个字符！");
                                                        return /^[a-zA-Z0-9_]{5}$/.test(input.val());
                                                    }

                                                    return true;
                                                },
                                validationMessage:$scope.UserId+$scope.required
                              }
                            },
                    userName:

                      { from: "userName",

                       validation: {

                            required:true,

                            validationMessage:$scope.UserName+$scope.required }},
                    email:{from:"email"},
                    roleId:{from:"roleId"},
                    telNo:{from:"telNo"},
                    doctorId:{from:"doctorId",type:"number"},
                    locale:{from:"locale"},
                    password:{from:"password"}


                }
            }
          }
        });