UrlRewrite正则表达式

[yaoyuchiccc]

list/([^-]*)-([^-]*)-([^-]*)(?:-([^-]*))(?:-([^-]*))-([0-9]*)\.html(?:\?(.*))?

list/xxxx-xxxx-xxxx-www-www-1.html

xxxx参数必须有 www参数可有可无

满足以下3种情况·我上面的表达式该怎么改
list/xxxx-xxxx-xxxx-1.html
list/xxxx-xxxx-xxxx-www-1.html
list/xxxx-xxxx-xxxx-www-www-1.html

[bdmh]

            System.IO.StreamReader reader = new System.IO.StreamReader("e:\\1.txt");
            string str = reader.ReadToEnd();
            Regex reg = new Regex(@"(?is)list/[^-]+-[^-]+-[^-]+-([^-]+-)?([^-]+-)?[0-9]\.html");
            MatchCollection mc = reg.Matches(str);
            foreach (Match m in mc)
            {
                MessageBox.Show(m.Value);
            }

[licai1210]

    protected void Page_Load(object sender, EventArgs e)
    {
        List<string> urlList = new List<string>();
        urlList.Add("list/xxxx-xxxx-xxxx-1.html");
        urlList.Add("list/xxxx-xxxx-xxxx-www-1.html");
        urlList.Add("list/xxxx-xxxx-xxxx-www-www-1.html");
        string pattern = @"(?is)list/(\w+-)+\d+\.html";
        Regex reg = new Regex(pattern);

        foreach (string url in urlList)
        {
            if (reg.IsMatch(url))
            {
                Response.Write(url + "===匹配成功");
                Response.Write("<br/>");
            }
        }
    }

[bdmh]

[Quote=引用 2 楼 的回复:]

(?is)list/(\w+-)+\d+\.html
[/Quote]
这个不能满足，必须有三个 xxxx

[yaoyuchiccc]

[Quote=引用 1 楼 的回复:]

C# code

System.IO.StreamReader reader = new System.IO.StreamReader("e:\\1.txt");
string str = reader.ReadToEnd();
Regex reg = new Regex(@"(?is)list/[^-]+-[^-]+-[……
[/Quote]
在帮我写一个啊·2楼那个不行
1 2 3 4 5 6 7
list/c1-t2-k3-b100-e200-o2-1.html

1可有可无以 c开头
2必须有 以 t开头
3必须有 以 k开头
45可有可无 b和e开头
6 可有可无 o开头
7必须有 数字就行