Asp. NET Filter HTML String Method Summary _ Practical Tips

The example in this article describes the method of ASP.net filtering HTML strings for your reference, as shown in the following code:

<summary> Remove HTML tags//////</summary>///<param name= "htmlstring" > including HTML source &LT;/PARAM&G   
T   
  <returns> removed text </returns> public static string getnohtmlstring (String htmlstring) {//delete script 
  htmlstring = Regex.Replace (htmlstring, @ "<script[^>]*?>.*?</script>", "", regexoptions.ignorecase); Delete html htmlstring = Regex.Replace (htmlstring, @ "<" (. [ 
  ^>]*) > "," ", regexoptions.ignorecase); 
  htmlstring = Regex.Replace (htmlstring, @ "([\ r \ n]) [\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 ("\ r \ n", ""); htmlstring = HttpContext.Current.Server.HtmlEncode (htmlstring). 

  Trim (); 
return htmlstring; 
///<summary> Get the displayed string to display HTML tags, but filter the dangerous HTML tags such as iframe,script. </summary> 
<param name= ' str ' > Unhandled string </param>///<returns></returns> public static string getsafehtml String (string str) {str = regex.replace (str, @ "<applet[^>]*?>.*?</applet>", "", Regexoptions.ignorecas 
  e); 
  str = regex.replace (str, @ "<body[^>]*?>.*?</body>", "", regexoptions.ignorecase); 
  str = regex.replace (str, @ "<embed[^>]*?>.*?</embed>", "", regexoptions.ignorecase); 
  str = regex.replace (str, @ "<frame[^>]*?>.*?</frame>", "", regexoptions.ignorecase); 
  str = regex.replace (str, @ "<script[^>]*?>.*?</script>", "", regexoptions.ignorecase); 
  str = regex.replace (str, @ "<frameset[^>]*?>.*?</frameset>", "", regexoptions.ignorecase); 
  str = regex.replace (str, @ "