asp截取字符串

[zhongwei127day]

str = "F:\wwwroot\admin\upload\2012060615160327327.png"

现在我想截取\admin\upload\2012060615160327327.png这么一串该怎么截取！
要求上源码！万分感谢

[bdmh]

            string source = @"F:\wwwroot\admin\upload\2012060615160327327.png";
            Regex reg = new Regex(@"admin.*");
            Match mm = reg.Match(source);
            MessageBox.Show(mm.Value);

[dalmeeme]

		string s = @"F:\wwwroot\admin\upload\2012060615160327327.png";
		string r = Regex.Match(s, @"(?<=\\[^\\]+)\\.*").Value;
		Response.Write(r);

output：
\admin\upload\2012060615160327327.png

[奔跑的老王]

string s = @"F:\wwwroot\admin\upload\2012060615160327327.png";
s.substring(9);

[奔跑的老王]

string s = @"F:\wwwroot\admin\upload\2012060615160327327.png";
s.substring(9);