C# 截取字符串的一个问题

[myitdog]

优酷的一个地址 http://v.youku.com/v_show/id_XMjEzOTIyOTE2.html
请问怎么截取出 XMjEzOTIyOTE2 这一部分？

[兔子-顾问]

string result = Regex.Match("http://v.youku.com/v_show/id_XMjEzOTIyOTE2.html",
                            @"[^/.]+(?=\.\w+\s*$)").Value;

[wuyq11]

Path.GetFileName(http://v.youku.com/v_show/id_XMjEzOTIyOTE2.html")
GetFileNameWithoutExtension

[wq326431904]

LastIndexOf

[chen8410]

string strUrl = "http://v.youku.com/v_show/id_XMjEzOTIyOTE2.html";
strUrl = strUrl.SubString(strUrl,strUrl.IndexOf("/id_")+1,strUrl.IndexOf(".html"));

[myitdog]

[Quote=引用 1 楼 wuyazhe 的回复:]
C# code
string result = Regex.Match("http://v.youku.com/v_show/id_XMjEzOTIyOTE2.html",
@"[^/.]+(?=\.\w+\s*$)").Value;
[/Quote]
正确，不过按要求应该为：

string result = Regex.Match("http://v.youku.com/v_show/id_XMjEzOTIyOTE2.html", @"[^id_.]+(?=\.\w+\s*$)").Value;

[myitdog]

[Quote=引用 4 楼 chen8410 的回复:]
C# code
string strUrl = "http://v.youku.com/v_show/id_XMjEzOTIyOTE2.html";
strUrl = strUrl.SubString(strUrl,strUrl.IndexOf("/id_")+1,strUrl.IndexOf(".html"));
[/Quote]

我明白你的意思了，应该是这样：

strUrl.Substring(strUrl.IndexOf("/id_") +4, strUrl.IndexOf(".html") - strUrl.IndexOf("/id_")-4)