正则怎么获得21456688754

[zhanghui1234w]

http://item.taobao.com/item.htm?id=21456688754&ali_refid=a3_420763_1007:1102249745:7:4043f4c103d9bc6af0a150eaaa84293d:809ab74692c8b2532811f1c84fbbe72b&ali_trackid=1_809ab74692c8b2532811f1c84fbbe72b

[骑着蜗牛去爬山]

(?i)(?<=[^a-z]id=)\d+

[ohkuy]

public static void Main()
        {
            string str = @"http://item.taobao.com/item.htm?id=21456688754&ali_refid=a3_420763_1007:1102249745:7:4043f4c103d9bc6af0a150eaaa84293d:809ab74692c8b2532811f1c84fbbe72b&ali_trackid=1_809ab74692c8b2532811f1c84fbbe72b";
            Regex reg = new Regex(@"(?<=id=)(\d+)");
            if (reg.IsMatch(str))
            {
                Match m = reg.Match(str);
                Console.WriteLine(m.Value);
            }
            Console.Read();
        }

输出： 21456688754

[dalmeeme]

		string s = "http://item.taobao.com/item.htm?id=21456688754&ali_refid=a3_420763_1007:1102249745:7:4043f4c103d9bc6af0a150eaaa84293d:809ab74692c8b2532811f1c84fbbe72b&ali_trackid=1_809ab74692c8b2532811f1c84fbbe72b";
		string id = HttpUtility.ParseQueryString(new Uri(s).Query)["id"];
		Response.Write(id);

[mr_cheung]

引用 3 楼 dalmeeme 的回复:

C# code?123string s = "http://item.taobao.com/item.htm?id=21456688754&ali_refid=a3_420763_1007:1102249745:7:4043f4c103d9bc6af0a150eaaa84293d:809ab74692c8b2532811f1c84fbbe72b&ali_t……

引用 2 楼 ohkuy 的回复:

C# code?1234567891011public static void Main() { string str = @"http://item.taobao.com/item.htm?id=21456688754&ali_refid=a3_420763_1007:1102249745:7:4043f4c103d9bc6a……

1

[ask8cn]

@"(?<=id=)\d+"