Regexp is available in ng_words

app/controllers/admin/ng_words_controller.rb

@@ -11,18 +11,31 @@ module Admin
     def create
       authorize :ng_words, :create?
 
+      begin
+        test_words
+      rescue
+        flash[:alert] = I18n.t('admin.ng_words.test_error')
+        redirect_to after_update_redirect_path
+        return
+      end
+
       @admin_settings = Form::AdminSettings.new(settings_params)
 
       if @admin_settings.save
         flash[:notice] = I18n.t('generic.changes_saved_msg')
         redirect_to after_update_redirect_path
       else
-        render :index
+        render :show
       end
     end
 
     private
 
+    def test_words
+      ng_words = settings_params['ng_words'].split(/\r\n|\r|\n/)
+      Admin::NgWord.reject_with_custom_words?('Sample text', ng_words)
+    end
+
     def after_update_redirect_path
       admin_ng_words_path
     end

app/models/admin/ng_word.rb

@@ -3,7 +3,11 @@
 class Admin::NgWord
   class << self
     def reject?(text)
-      ng_words.any? { |word| text.include?(word) }
+      ng_words.any? { |word| include?(text, word) }
+    end
+
+    def reject_with_custom_words?(text, custom_ng_words)
+      custom_ng_words.any? { |word| include?(text, word) }
     end
 
     def hashtag_reject?(hashtag_count)
@@ -16,6 +20,14 @@ class Admin::NgWord
 
     private
 
+    def include?(text, word)
+      if word.start_with?('?') && word.size >= 2
+        text =~ /#{word[1..]}/i
+      else
+        text.include?(word)
+      end
+    end
+
     def ng_words
       Setting.ng_words || []
     end