diff --git a/app/controllers/admin/asks_controller.rb b/app/controllers/admin/asks_controller.rb
index 0207c36..a8a1906 100644
--- a/app/controllers/admin/asks_controller.rb
+++ b/app/controllers/admin/asks_controller.rb
@@ -426,6 +426,7 @@ class Admin::AsksController < OrbitAdminController
       param_clone = param.clone
       param_clone['default_setting'].each { |k, v| param_clone['default_setting'][k] = (v == 'true'? true : false) if param_clone['default_setting'][k].class==String} 
       param_clone.delete('custom_fields')
+      param_clone.delete('email_regex')
       custom_fields = ask_setting['custom_fields'].clone
       params_custom_fields = (params.require(collection_name).require('custom_fields') rescue {})
       params_custom_fields.each do |k,v|
diff --git a/app/controllers/asks_controller.rb b/app/controllers/asks_controller.rb
index 2610e26..7d5239b 100644
--- a/app/controllers/asks_controller.rb
+++ b/app/controllers/asks_controller.rb
@@ -39,10 +39,12 @@ class AsksController < ApplicationController
       csrf_value = OrbitHelper.request.session[:_csrf_token] || SecureRandom.base64(32)
       token_tag = hidden_field_tag('authenticity_token',csrf_value)
       switch_form = cal_switch_form(ask_settings,categories,token_tag,referer_url)
+      email_regex = @default_ask_setting.email_regex_enable ? @default_ask_setting.email_regex.gsub("\\A","^").gsub("\\z","$") : nil
       {
         'fields' => defalt_fields,
         'extras'=>{
-                    'switch_form' => switch_form
+                    'switch_form' => switch_form,
+                    'email_regex' => email_regex
                   }
       }
     else
@@ -141,6 +143,7 @@ class AsksController < ApplicationController
       switch_form = cal_switch_form(ask_settings,categories,token_tag,referer_url)
       tags = module_app.tags
       ask_question = AskQuestion.new(id: nil)
+      email_regex = @default_ask_setting.email_regex_enable ? @default_ask_setting.email_regex.gsub("\\A","^").gsub("\\z","$") : nil
       {
         'layout_type' => 'index',
         'ask_question' => ask_question,
@@ -149,7 +152,8 @@ class AsksController < ApplicationController
         'module_app' => module_app,
         'switch_form' => switch_form,
         'ask_setting' => ask_setting,
-        'default_ask_setting' => @default_ask_setting
+        'default_ask_setting' => @default_ask_setting,
+        'email_regex' => email_regex
       }
     elsif  @layout_type == 'published_index'
       page_number = OrbitHelper.page_number.to_i
@@ -178,10 +182,15 @@ class AsksController < ApplicationController
     temp_params = create_params
     all_to_save = []
     ask_setting = AskCategorySetting.where(category_id: params['ask_question']['category_id']).first
+    email_regex = nil
     if ask_setting.nil?
       ask_setting = AskSetting.first
       ask_setting = AskSetting.create() if ask_setting.nil?
+      email_regex = ask_setting.email_regex
+    else
+      email_regex = AskSetting.first.email_regex rescue nil
     end
+    email_regex = nil if !(ask_setting.email_regex_enable) || !(ask_setting.default_setting['mail'])
     ask_setting.custom_fields.select{|k,v| v['type']=='file' || v['type']=='image'}.each do |k,v|
       file = temp_params['custom_values'][k]
       if !file.blank?
@@ -199,7 +208,7 @@ class AsksController < ApplicationController
         temp_params['custom_values'][to_save[0]] = [temp_params['custom_values'][to_save[0]].original_filename ,to_save[1].file.url]
       end
     end
-    if flag
+    if (email_regex ? ::Regexp.new(email_regex).match?(temp_params["mail"].to_s) : true) && flag
       @ask_question.update_attributes(temp_params)
       build_email(@ask_question)
       redirect_to "#{params[:referer_url]}?method=thank"
@@ -346,7 +355,7 @@ class AsksController < ApplicationController
             </div>
           </div>"
       end.join
-      "<form id=\"#{form_id}\" action=\"#{form_url}\" enctype=\"multipart/form-data\" method=\"post\" class=\"form-horizontal\" accept-charset=\"UTF-8\"  style=\"#{is_hidden ? 'display: none;' : ''}\">
+      "<form id=\"#{form_id}\" action=\"#{form_url}\" enctype=\"multipart/form-data\" method=\"post\" class=\"form-horizontal ask-question-form\" accept-charset=\"UTF-8\"  style=\"#{is_hidden ? 'display: none;' : ''}\">
         #{token_tag}
         <div data-level=\"0\" data-list=\"fields\">
           #{tmp}
diff --git a/app/models/ask_setting.rb b/app/models/ask_setting.rb
index 594de92..9018543 100644
--- a/app/models/ask_setting.rb
+++ b/app/models/ask_setting.rb
@@ -35,6 +35,8 @@ class AskSetting
   def field_name_translations(k)
     I18n.available_locales.map{|v| [v.to_s,self.field_name(k,v.to_s)]}.to_h
   end
+  field :email_regex_enable, type: Boolean, default: false
+  field :email_regex, type: String, default: '\A[^@\s]+@([^@.\s]+\.)+[^@.\s]+\z'
   field :sort_number, type: Hash, default: {}
   field :default_setting, type: Hash,default: {ask_category_id: true,name: true,sex: false,mail: true,phone: false,appointment: false,recaptcha: false,agree_show: true,agree_usage: false}
   field :default_setting_field_name, type: Hash,default: {}
@@ -49,7 +51,7 @@ class AskSetting
         attrs.delete(k)
       end
     end
-    attrs.except("_type","_id","uid","updated_at", "created_at")
+    attrs.except("_type","_id","uid","updated_at", "created_at", "email_regex")
   end
   def self.get_disp_fields_infos(cat=nil)
     ask_setting = nil
diff --git a/app/views/admin/asks/_ask_setting.html.erb b/app/views/admin/asks/_ask_setting.html.erb
index 237c7e3..edf1f4b 100644
--- a/app/views/admin/asks/_ask_setting.html.erb
+++ b/app/views/admin/asks/_ask_setting.html.erb
@@ -98,6 +98,27 @@
    set_input_name("#{form_type}")
 %>
 <fieldset>
+  <% if @has_email_regex %>
+    <div class="control-group">
+      <div class="control-label">
+        <label for="ask_email_regex"><%= t("ask.email_regex") %>:</label>
+      </div>
+      <div class="controls">
+        <%= f.check_box :email_regex_enable, {:id=>"email_regex_enable"} %><%= t("ask.enable") %>
+        <div style="clear: both;"></div>
+        <%= f.text_field :email_regex, {:id=>"ask_email_regex", :style => "width: 30em;"}.merge(f.object.email_regex_enable ? {} : {:disabled=>"disabled"}) %>
+      </div>
+    </div>
+    <script>
+      $("#email_regex_enable").click(function(){
+        if($(this).prop("checked")){
+          $("#ask_email_regex").removeAttr("disabled");
+        }else{
+          $("#ask_email_regex").attr("disabled","disabled");
+        }
+      })
+    </script>
+  <% end %>
   <table>
     <thead>
       <tr>
diff --git a/app/views/admin/asks/setting.html.erb b/app/views/admin/asks/setting.html.erb
index 1521831..2e947cb 100644
--- a/app/views/admin/asks/setting.html.erb
+++ b/app/views/admin/asks/setting.html.erb
@@ -25,5 +25,5 @@
   })
 </script>
 <%= form_for @ask_setting,method: 'post',url:  @url,html: { class: 'form-horizontal main-forms previewable' } do |f| %>
-  <%= render partial: 'ask_setting',locals:{ask_setting: @ask_setting,f: f,submit_text: t('submit')} %>
+  <%= render partial: 'ask_setting',locals:{ask_setting: @ask_setting,f: f,submit_text: t('submit'), :@has_email_regex => true} %>
 <% end %>
\ No newline at end of file
diff --git a/app/views/asks/index.html.erb b/app/views/asks/index.html.erb
index e52b37d..8f6b750 100644
--- a/app/views/asks/index.html.erb
+++ b/app/views/asks/index.html.erb
@@ -7,6 +7,7 @@
   ask_setting = data["ask_setting"]
   set_input_name('ask_question')
   @default_ask_setting = data['default_ask_setting']
+  email_regex = data['email_regex']
 %>
 <% if data['layout_type'] != 'index' %>
   <%= render template: "asks/#{data['layout_type']}",:locals => { :data => data, :ask_setting => ask_setting } %>
@@ -143,5 +144,29 @@ $(function(){
 
   // }
 })
+$(document).ready(function(){
+  var email_regex = "<%=email_regex%>";
+  if(email_regex.length != 0){
+    email_regex = new RegExp(email_regex);
+    var submit_flag = false;
+    $(".ask-question-form").each(function(i, form){
+      var $form = $(form);
+      if($form.length != 0 && $form.find('#ask_question_mail').length != 0){
+        $form.submit(function(){
+          if(!submit_flag){
+            submit_flag = true;
+            if(email_regex.test($form.find('#ask_question_mail').val())){
+              submit_flag = false;
+            }else{
+              alert("<%=t('ask.please_check_email_format')%>");
+              submit_flag = false;
+              return false;
+            }
+          }
+        })
+      }
+    })
+  }
+})
 </script>
 <% end %>
\ No newline at end of file
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 151c354..2c08be4 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -2,6 +2,9 @@ en:
   situation: Situation
   sex: Sex
   ask:
+    please_check_email_format: "Please check email format!"
+    enable: Enable
+    email_regex: Email validation regex
     please_save: Please click "Save Order" button when you done.
     save_order: Save Order
     order_fields: Order Fields
diff --git a/config/locales/zh_tw.yml b/config/locales/zh_tw.yml
index aab12fc..5b2be9f 100644
--- a/config/locales/zh_tw.yml
+++ b/config/locales/zh_tw.yml
@@ -6,6 +6,9 @@ zh_tw:
     errors:
       verification_failed: 驗證碼錯誤
   ask:
+    please_check_email_format: "請檢察email是否正確!"
+    enable: 啟用
+    email_regex: Email驗證regex
     please_save: 調整完後, 請點選"儲存順序"
     save_order: 儲存順序
     order_fields: 排序欄位
diff --git a/modules/ask/_ask_widget_form.html.erb b/modules/ask/_ask_widget_form.html.erb
index 9682a8d..27d8ad6 100644
--- a/modules/ask/_ask_widget_form.html.erb
+++ b/modules/ask/_ask_widget_form.html.erb
@@ -74,5 +74,29 @@
         }
       }
     })
+    $(document).ready(function(){
+      var email_regex = "{{email_regex}}";
+      if(email_regex.length != 0){
+        email_regex = new RegExp(email_regex);
+        var submit_flag = false;
+        $(".ask-question-form").each(function(i, form){
+          var $form = $(form);
+          if($form.length != 0 && $form.find('#ask_question_mail').length != 0){
+            $form.submit(function(){
+              if(!submit_flag){
+                submit_flag = true;
+                if(email_regex.test($form.find('#ask_question_mail').val())){
+                  submit_flag = false;
+                }else{
+                  alert("<%=t('ask.please_check_email_format')%>");
+                  submit_flag = false;
+                  return false;
+                }
+              }
+            })
+          }
+        })
+      }
+    })
   </script>
 </div>
\ No newline at end of file