去除html中的脚本/样式/标签

//删除脚本
 Htmlstring = Regex.Replace(Htmlstring, @" <script(\s[^>]*?)?>[\s\S]*? </script>", "", RegexOptions.IgnoreCase);
 //删除样式
 Htmlstring = Regex.Replace(Htmlstring, @" <style(\s[^>]*?)?>[\s\S]*? </style>", "", RegexOptions.IgnoreCase);
 //删除html标签
 Htmlstring = Regex.Replace(Htmlstring, @" <(.[^>]*)>", "", RegexOptions.IgnoreCase);