去除html标记和替换script标记

/// <summary>
       /// 去除HTML标记
       /// </summary>
       /// <param name="NoHTML">包括HTML的源码 </param>
       /// <returns>已经去除后的文字</returns>
       public static string RemoveHTML(string Htmlstring)
       {
           if (string.IsNullOrEmpty(Htmlstring))
           {
               return string.Empty;
           }
           //删除脚本
           Htmlstring = Regex.Replace(Htmlstring, @"<script[^>]*?>.*?</script>", "", RegexOptions.IgnoreCase);

           //删除HTML
           Htmlstring = Regex.Replace(Htmlstring, @"<(.[^>]*)>", "", RegexOptions.IgnoreCase);
           Htmlstring = Regex.Replace(Htmlstring, @"([
])[s]+", "", RegexOptions.IgnoreCase);
           Htmlstring = Regex.Replace(Htmlstring, @"-->", "", RegexOptions.IgnoreCase);
           Htmlstring = Regex.Replace(Htmlstring, @"<!--.*", "", RegexOptions.IgnoreCase);
           Htmlstring = Regex.Replace(Htmlstring, @"&(quot|#34);", """, RegexOptions.IgnoreCase);
           Htmlstring = Regex.Replace(Htmlstring, @"&(amp|#38);", "&", RegexOptions.IgnoreCase);
           Htmlstring = Regex.Replace(Htmlstring, @"&(lt|#60);", "<", RegexOptions.IgnoreCase);
           Htmlstring = Regex.Replace(Htmlstring, @"&(gt|#62);", ">", RegexOptions.IgnoreCase);
           Htmlstring = Regex.Replace(Htmlstring, @"&(nbsp|#160);", " ", RegexOptions.IgnoreCase);
           Htmlstring = Regex.Replace(Htmlstring, @"&(iexcl|#161);", "xa1", RegexOptions.IgnoreCase);
           Htmlstring = Regex.Replace(Htmlstring, @"&(cent|#162);", "xa2", RegexOptions.IgnoreCase);
           Htmlstring = Regex.Replace(Htmlstring, @"&(pound|#163);", "xa3", RegexOptions.IgnoreCase);
           Htmlstring = Regex.Replace(Htmlstring, @"&(copy|#169);", "xa9", RegexOptions.IgnoreCase);
           Htmlstring = Regex.Replace(Htmlstring, @"&#(d+);", "", RegexOptions.IgnoreCase);
           Htmlstring.Replace("<", "");
           Htmlstring.Replace(">", "");
           Htmlstring.Replace("
", "");

           return Htmlstring;
       }


       #region 正则表达式替换包含script脚本攻击的script代码
       /// <summary>
       /// 正则表达式替换包含script脚本攻击的script代码
       /// author:Andrew.He
       /// </summary>
       /// <param name="scriptString">包含脚本攻击的字符串</param>
       /// <returns>替换脚本攻击的字符串</returns>
       public static string RemoveScript(string scriptString)
       {
           if (string.IsNullOrEmpty(scriptString))
           {
               return scriptString;
           }

           //执行替换操作
           scriptString = Regex.Replace(scriptString, @"<[ ]*script", "[script ", RegexOptions.IgnoreCase);
           scriptString = Regex.Replace(scriptString, @"/[ ]*script[ ]*>", " /script]", RegexOptions.IgnoreCase);

           return scriptString;
       }
       #endregion