string test = @"\n\t\t\t\t@\n\t\t\t\t1|\n\t\t\t\t完成\n\t\t\t\t@\n\t\t\t\t2|\n\t\t\t\t末完成\n\t\t\t\t@\n\t\t\t\t3|\n\t\t\t\t提交中";
            string pattern = @"(?i)(\d+)\|.*?([\u4e00-\u9fa5]+)";
            foreach (Match m in Regex.Matches(test, pattern))
            {
                string code = m.Groups[1].Value;//1
                string name = m.Groups[2].Value;//完成
            }

------解决方案--------------------

C# code
        string s = "\n\t\t\t\t@\n\t\t\t\t1|\n\t\t\t\t完成\n\t\t\t\t@\n\t\t\t\t2|\n\t\t\t\t末完成\n\t\t\t\t@\n\t\t\t\t3|\n\t\t\t\t提交中";
        MatchCollection matches = Regex.Matches(s, @"(\d+)\|\n\t+(\S+)");
        foreach (Match match in matches)
        {
            Response.Write(match.Groups[1].Value + ":" + match.Groups[2].Value + "<br/>");
        }