How to add ng-pattern in mvc?

I get an error for ng-pattern...how can i add it in @Html.TextBoxFor? I tried with ng-pattern also but same result...it throw me an error...i know that is for ng-model in mvc i need to use ng_model but for ng-pattern is not working

    div class="form-group">
    <label for="licencenumber" class="control-label col-lg-5 col-md-6">@Html.Label(@Translator.Translate("LICENCE_NUMBER")): <span id="licenceNumberRequired" class="required display">*</span></label>
  <div class="col-lg-7 col-md-6">
  @Html.TextBoxFor(m => m.DocumentNumber, new { @class = "form-control", id = "documentNumber", @maxlength = "13", ng_model="documentNumber",ng_pattern="^/[\w ]+$/" })

    </div>
 </div>