<form class="form-horizontal">
                            @{
                                List<string> Fields = Regex.Matches(Model, @"\{%(.+?)%\}").Cast<Match>().Select(m => m.Groups[1].Value).ToList().Distinct().ToList();
                                string Preview = Model;
                            }

                            @foreach (string Field in Fields)
                            {
                                Preview = Preview.Replace("{%" + Field + "%}", "<span class='field-" + Field + "'>???</span>");

                                <div class="form-group">
                                    <label for="inputEmail3" class="col-sm-4 control-label">@Field :</label>
                                    <div class="col-sm-8">
                                        <input type="text" class="form-control" onkeyup="$('.field-@Field').html($(this).val())" value="???">
                                    </div>
                                </div>
                            }
                            <div class="form-group">
                                <div class="col-sm-offset-4 col-sm-10">
                                    <button type="submit" class="btn btn-default">Save</button>
                                </div>
                            </div>
                        </form>