///
        /// 转义字符串中所有正则特殊字符
        ///
        /// 传入字符串
        ///
        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 list = new List();
            foreach (Match item in ms)
            {
                if (list.Contains(item.Value))
                    continue;
                input = input.Replace(item.Value, "\" + item.Value);
                list.Add(item.Value);
            }
            return input;
        }