/// <summary>
        /// 获取某字符串中间的字符串，非贪婪模式
        /// </summary>
        /// <param name="input">全字符串</param>
        /// <param name="left">左边字符</param>
        /// <param name="right">右边字符</param>
        /// <returns></returns>
        public static List<string> GetCenterString(String input, String left, String right)
        {
            List<string> list = new List<string>();
            Regex reg = new Regex(left + "(((?!" + left + ").)+?)" + right);
            foreach (Match m in reg.Matches(input))
            {
                list.Add(m.Value);
            }

            return list;
        }

 string all = @"这是一段测试数据{{dasdasdas}}这是一段测试数据{{ddd}{这是一段测试数据{{dasd}";
            List<string> strList = StringPlus.GetCenterString(all, "{", "}");