过滤字符串

去掉标签：Server.HtmlEncode编码
           Server.HtmlDecode 解码（存入数据库）

 public static string StripHTML(string strHtml)
        {
            string[] aryReg ={

                                @"<script[^>]*?>.*?</script>",
                                @"<(\/\s*)?!?((\w+:)?\w+)(\w+(\s*=?\s*(([""'])(\\[""'tbnr]|[^\7])*?\7|\w+)|.{0})|\s)*?(\/\s*)?>",

                                @"([\r\n])[\s]+",

                                @"&(quot|#34);",

                                @"&(amp|#38);",

                                @"&(lt|#60);",

                                @"&(gt|#62);",

                                @"&(nbsp|#160);",

                                @"&(iexcl|#161);",

                                @"&(cent|#162);",

                                @"&(pound|#163);",

                                @"&(copy|#169);",

                                @"&#(\d+);",

                                @"-->",

                                @"<!--.*\n"

                               };



            string[] aryRep = {

                                "",

                                "",

                                "",

                                "\"",

                                "&",

                                "<",

                                ">",

                                " ",

                                "\xa1",//chr(161),

                                "\xa2",//chr(162),

                                "\xa3",//chr(163),

                                "\xa9",//chr(169),

                                "",

                                "\r\n",

                                ""

                               };



            string newReg = aryReg[0];

            string strOutput = strHtml;

            for (int i = 0; i < aryReg.Length; i++)
            {

                System.Text.RegularExpressions.Regex regex = new System.Text.RegularExpressions.Regex(aryReg[i], System.Text.RegularExpressions.RegexOptions.IgnoreCase);

                strOutput = regex.Replace(strOutput, aryRep[i]);

            }

            strOutput.Replace("<", "");

            strOutput.Replace(">", "");

            strOutput.Replace("\r\n", "");

            return strOutput;

        }