/// <summary>

        /// 转义字符串中所有正则特殊字符

        /// </summary>

        /// <param name="input">传入字符串</param>

        /// <returns></returns>

        string FilterString(string input)

        {

            input = input.Replace("\\", "\\\\");//先替换“\”，不然后面会因为替换出现其他的“\”

            Regex r = new Regex("[\\*\\.\\?\\+\\$\\^\\[\\]\\(\\)\\{\\}\\|\\/]");

            MatchCollection ms = r.Matches(input);

            List<string> list = new List<string>();

            foreach (Match item in ms)

            {

                if (list.Contains(item.Value))

                    continue;

                input = input.Replace(item.Value, "\\" + item.Value);

                list.Add(item.Value);

            }

            return input;

        }