冰天雪地在线裸求个UrlRewriter的正则表达式

Question

冰天雪地在线裸求个UrlRewriter的正则表达式 需求： www.xxxxx.com/aaa ----> www.xxxxx.com/Search.aspx?ID=aaa
      www.xxxxx.com/aaa.aspx 不变，正常访问 
      www.xxxxx.com/b/aaa ----> www.xxxxx.com/book/Show.aspx?ID=aaa
      www.xxxxx.com/book/aaa.aspx ----> 不变，正常访问
      www.xxxxx.com/u/aaa ----> www.xxxxx.com/user/Show.aspx?ID=aaa
      www.xxxxx.com/user/aaa.aspx ----> 不变，正常访问概括： 页面肯定都是.aspx的页面，不会有其他扩展名的页面。所以只要判断地址中是否带".aspx"即可。
      如果带.aspx 则不重写，如果不带.aspx 则视为重写。
      重写分为两种情况，第一种情况是根目录下重写 www.xxxxx.com/aaa 
      第二种情况是二级目录下的重写 www.xxxxx.com/b/aaa 
      
      只有这两种情况，不存在三级目录重写的情况。下面是我尝试着写的，一塌糊涂，请高手指点，谢谢。      <RewriterRule>
        <LookFor>~/(.*)</LookFor>
        <SendTo>~/Default.aspx?ID=$1</SendTo>
      </RewriterRule>
      <RewriterRule>
        <LookFor>~/B/(.*)\.aspx</LookFor>
        <SendTo>~/Book/Show.aspx?ID=$1</SendTo>
      </RewriterRule>

Answer 1

<RewriterConfig>
<Rules>
<RewriterRule>
<LookFor>~/([^/]*)(?&lt;!\.aspx)$</LookFor>
<SendTo>~/Search.aspx?id=$1</SendTo>
</RewriterRule>
<RewriterRule>
<LookFor>~/b/([^/]*)(?&lt;!\.aspx)$</LookFor>
<SendTo>~/book/Show.aspx?id=$1</SendTo>
</RewriterRule>
<RewriterRule>
<LookFor>~/u/([^/]*)(?&lt;!\.aspx)$</LookFor>
<SendTo>~/user/Show.aspx?id=$1</SendTo>
</RewriterRule>
</Rules>
</RewriterConfig>

Answer 2

 <RewriterRule>
        <LookFor>~/(\w+)</LookFor>
        <SendTo>~/Search.aspx?ID=$1</SendTo>
      </RewriterRule>
      <RewriterRule>
        <LookFor>~/[Bb]/(\w+)</LookFor>
        <SendTo>~/Book/Show.aspx?ID=$1</SendTo>
      </RewriterRule>
 <RewriterRule>
        <LookFor>~/u/(\w+)</LookFor>
        <SendTo>~/user/Show.aspx?ID=$1</SendTo>
      </RewriterRule>