求一个字符串截取方法：从后面开始取二个“/”之间的内容

[dowoocn]

如题：
假如：有一 s="http:/www.xxx.com/www/fff/aa/55875/"
我现在要得到“55875”
该如何写？谢谢了！！

[windwl]

dim str,arr,ss
str ="http:/www.xxx.com/www/fff/aa/55875/" 
arr = split(str,"/")
ss = arr(ubound(arr)-1)
response.Write(ss)

[dowoocn]

谢谢楼上！

[littlelam]

<%
dim s
s="http:/www.xxx.com/www/fff/aa/55875/fsdf" 
dim tmp
tmp = Left(s,InstrRev(s,"/")-1)
Response.Write(Right(tmp,Len(tmp)-InStrRev(tmp,"/")))
%>

[yuanmingyin]

C#

string Test = "hehe/haha/xixi/";
			Array Ary_test= new Array[10];
			Ary_test = System.Text.RegularExpressions.Regex.Split(Test,"/");
			MessageBox.Show(Ary_test.GetValue(1).ToString());