[正则]提取数字！

Question

http://item.taobao.com/item.htm?id=2069873815
http://item.taobao.com/item.htm?id=7781868337&ali_refid=a3_419096_1006:1102297287:6::0aff0c4c909f403f035119407b76b583&ali_trackid=1_0aff0c4c909f403f035119407b76b583
http://item.taobao.com/item.htm?id=7442906125
http://item.taobao.com/item.htm?id=8012084049
http://item.taobao.com/item.htm?id=8012084049
http://item.taobao.com/item.htm?id=8232210597
http://item.taobao.com/item.htm?id=7781868337
http://item.taobao.com/item.htm?id=7583530623
http://item.taobao.com/item.htm?id=7452311445
http://item.taobao.com/item.htm?id=7128628219
http://item.taobao.com/item.htm?id=7734268589&cm_cat=50010531
http://item.taobao.com/item.htm?id=7781868337
如何提取id=后面的数字？
提取结果如下：
2069873815
7781868337
7442906125
8012084049
8012084049
8232210597
7781868337
7583530623
7452311445
7128628219
7734268589
7781868337

Answer 1

MatchCollection mc = Regex.Matches(html,@"(?is)(?<=id=)(?<value>\d+)");
foreach(Match m in mc)
{
    //m.Groups["value"].Value;
}

Answer 2

        string str = @"http://item.taobao.com/item.htm?id=2069873815
http://item.taobao.com/item.htm?id=7781868337&ali_refid=a3_419096_1006:1102297287:6::0aff0c4c909f403f035119407b76b583&ali_trackid=1_0aff0c4c909f403f035119407b76b583
http://item.taobao.com/item.htm?id=7442906125
http://item.taobao.com/item.htm?id=8012084049
http://item.taobao.com/item.htm?id=8012084049
http://item.taobao.com/item.htm?id=8232210597
http://item.taobao.com/item.htm?id=7781868337
http://item.taobao.com/item.htm?id=7583530623
http://item.taobao.com/item.htm?id=7452311445
http://item.taobao.com/item.htm?id=7128628219
http://item.taobao.com/item.htm?id=7734268589&cm_cat=50010531
http://item.taobao.com/item.htm?id=7781868337";
        MatchCollection mc = Regex.Matches(str, @"http\://item\.taobao\.com/item\.htm\?id=(\d+)");
        for(int i=0;i<mc.Count;i++)
        {
            Response.Write(mc[i].Result("$1") + "<br>");
        }

Answer 3

void Main()
{
  string str = @"http://item.taobao.com/item.htm?id=2069873815
http://item.taobao.com/item.htm?id=7781868337&ali_refid=a3_419096_1006:1102297287:6::0aff0c4c909f403f035119407b76b583&ali_trackid=1_0aff0c4c909f403f035119407b76b583
http://item.taobao.com/item.htm?id=7442906125
http://item.taobao.com/item.htm?id=8012084049
http://item.taobao.com/item.htm?id=8012084049
http://item.taobao.com/item.htm?id=8232210597
http://item.taobao.com/item.htm?id=7781868337
http://item.taobao.com/item.htm?id=7583530623
http://item.taobao.com/item.htm?id=7452311445
http://item.taobao.com/item.htm?id=7128628219
http://item.taobao.com/item.htm?id=7734268589&cm_cat=50010531
http://item.taobao.com/item.htm?id=7781868337";
foreach(Match m in  Regex.Matches(str, @"(?is)(?<=id=)\d{10,}"))
{
 Console.WriteLine(m.Value);
}
 
}/*
2069873815
7781868337
7442906125
8012084049
8012084049
8232210597
7781868337
7583530623
7452311445
7128628219
7734268589
7781868337*/