过滤非法字符

/// <summary>过滤脏字将字体替换
        /// </summary>
        /// <param name="text"></param>
        /// <returns></returns>
        public static string FilterKeyWord(string text, string repStr)
        {
            string input = text;

            for (int i = 0; i < repStr.Split('｜').Length; i++)
            {
                MatchCollection matches = null;
                string temp = protectHtml(input, ref matches);
                temp = Filter(temp, repStr.Split('｜')[i]);
                input = restoreHtml(temp, matches);
            }
            return input;
        }
private static string protectHtml(string input, ref MatchCollection matches)
        {
            //匹配html的正则
            Regex htmlReg =
                new Regex(@"/<.*?/>", RegexOptions.Multiline);
            //获取匹配集合
            matches = htmlReg.Matches(input);
            //设置替换字串
            string markFormat = "[[{0}]]";
            //替换html,记录位置
            for (int i = 0; i < matches.Count; i++)
            {
                input = input.Replace(matches[i].Value, string.Format(markFormat, i));
            }
            return input;
        }
private static string restoreHtml(string input, MatchCollection matches)
        {
            //设置替换字串
            string markFormat = "[[{0}]]";
            for (int i = 0; i < matches.Count; i++)
            {
                input = input.Replace(string.Format(markFormat, i), matches[i].Value);
            }
            return input;
        }
private static string Filter(string input, string replace)
        {
            //设置星号
            string replaceformat = "*";
            Regex reg = new Regex(String.Format("{0}", replace), RegexOptions.Multiline);
            return reg.Replace(input, string.Format(replaceformat, replace));
        }


调用
 string badStr = "<p>adfsf变化色和sss性<a href='#?id=2008'>年份</a></p>";
Response.Write("<br/>" + FilterKeyWord(badStr , new Config().Badtext));
一般把脏话写在xml,new Config().Badtext这个我就不具体，
楼主测试时候
Response.Write("<br/>" + FilterKeyWord(badStr ,"色｜性" ));