Incorrect generate validator for model with RegularExpression attribute

[Sergey Popov]

Have simple model with RegularExpression attribute. This attribute correct work with unobtrusive validation.

public class PersonModel

{

    public int PersonId { get; set; }

    [RegularExpression(@"\+?\d[\d-]+\d")]

    public string Phone { get; set; }

}

Render data in Grid. 

@(Html.Kendo().Grid<PersonModel>().Name("Persons")

    .DataSource(src => src.Ajax()

        .Model(model => model.Id(p => p.PersonId))

        .Read("_GetPersons", "Account")

        .Create("_CreatePerson", "Account")

        .Update("_UpdatePerson", "Account")

        .Destroy("_DestroyPerson", "Account")

        .ServerOperation(true)

    )

    .ToolBar(command => command.Create())

    .Columns(col =>

    {

        col.Bound(p => p.PersonId).Hidden();

        col.Bound(p => p.Phone);

        col.Command(command =>

        {

            command.Edit();

            command.Destroy();

        });

    })

    .Pageable()

    .Editable(e => e.Mode(GridEditMode.PopUp))

)

On edit record in popup editor, have javascript error "SyntaxError: invalid quantifier" because in html field render parameter data-val-regex-pattern="+?d[ds-]+d". All backslashes is disappear. 
ОК, write expression as @"\\+?\\d[\\d-]+\\d". Validation on page is OK, but in action method ModelState.IsValid = false. How can I solve this problem? Code of action method see below.

[HttpPost]

public ActionResult _UpdatePerson([DataSourceRequest] DataSourceRequest request, PersonModel model)

{

    if (model != null && ModelState.IsValid)

    {

        DB.UpdatePerson(model);

    }

    return new JsonNetResult { Data = ModelState.ToDataSourceResult() };

}

[Nikolay Rusev]

Hello Sergey,

Indeed this is known limitation in current Grid implementation. It will be addressed with next official release.

Regards,
Nikolay Rusev
the Telerik team