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List<string> list = new List<string> { "cate_34/taicha/bdcs/cate_12/abc/cate_13/taicha/baidu", "cate_12/abc/cate_13/taicha/baidu", "cate_13/taicha/baidu" };
Regex reg = new Regex(@"(?i)cate_\d+(?:(?!cate_\d+).)*$");
foreach (string s in list)
Console.WriteLine(reg.Match(s).Value);