自己对正则表达式不熟悉，所以在配置UrlRewrite的时候遇到了很大的问题，终于在网上找到一些资料，基本上可以解决常用的配置：

1. urlrewrite.xml配置：

<?xml version="1.0" encoding="UTF-8"?>    
<!DOCTYPE urlrewrite SYSTEM "../resources/urlrewrite3.2.dtd" >    
<urlrewrite>    
         <rule>       
                 <note>       
                         无参数匹配      
                 </note>       
                 <from>^/([_a-zA-Z]+[_0-9a-zA-Z-/]*[_0-9a-zA-Z]+)$</from>       
                 <to type="forward">/$1.do</to>       
                 
         </rule>    
            
         <rule>       
                 <note>    
                     将所有.jsp文件映射为.html    
                 </note>    
                 <from>^/([_a-zA-Z]+[_0-9a-zA-Z-/]*[_0-9a-zA-Z]+).html$</from>       
                 <to type="forward">/$1.jsp</to>       
         </rule>    
            
     <!--    
         <outbound-rule>    
                 <note>    
                     The outbound-rule specifies that when response.encodeURL is called (if you are using JSTL c:url)    
                     the url /rewrite-status will be rewritten to /test/status/.    
            
                     The above rule and this outbound-rule means that end users should never see the    
                     url /rewrite-status only /test/status/ both in thier location bar and in hyperlinks    
                     in your pages.    
                 </note>    
                 <from>/rewrite-status</from>    
                 <to>/test/status/</to>    
         </outbound-rule>   

  Redirect one url    
         <rule>    
             <from>/some/old/page.html</from>    
             <to type="redirect">/very/new/page.html</to>    
         </rule>    
   
     Redirect a directory    
         <rule>    
             <from>/some/olddir/(.*)</from>    
             <to type="redirect">/very/newdir/$1</to>    
         </rule>    
   
     Clean a url    
         <rule>    
             <from>/products/([0-9]+)</from>    
             <to>/products/index.jsp?product_id=$1</to>    
         </rule>    
     eg,/products/1234 will be passed on to /products/index.jsp?product_id=1234 without the user noticing.    
   
     Browser detection    
         <rule>    
             <condition name="user-agent">Mozilla/[1-4]</condition>    
             <from>/some/page.html</from>    
             <to>/some/page-for-old-browsers.html</to>    
         </rule>    
     eg,will pass the request for /some/page.html on to /some/page-for-old-browsers.html only for older    
     browsers whose user agent srtings match Mozilla/1,Mozilla/2,Mozilla/3 or Mozilla/4.    
   
     Centralised browser detection    
         <rule>    
             <condition name="user-agent">Mozilla/[1-4]</condition>    
             <set type="request" name="browser">moz</set>    
         </rule>    
     eg,all requests will be checked against the condition and if matched    
     request.setAttribute("browser","moz") will be called.    
   
     -->    
            
</urlrewrite> 

<rule>   
         <note>homepage   blog username like http://blog.csdn.net/pigo</note>    
             <from>/u/([a-zA-Z0-9 ]+)/?$</from>   
             <to>/user/main.jsp?username=$1 </to>   
         </rule>   
         <rule>   
         <note>homepage   blog username like http://blog.csdn.net/pigo/RSS.xml </note>    
             <from>/u/([a-zA-Z0-9 ]+)/RSS.xml $</from>   
             <to>/user/RSS.jsp?username=$1 </to>   
         </rule>   
         <rule>   
         <note> blog catgory   http://blog.csdn.net/pigo/category/42406.html</note>    
             <from>/u/([a-zA-Z0-9 ]+)/category/([a-zA-Z0- 9 ]+).html</from>   
             <to>/user/cat.jsp?username=$1 &catno=$ 2 </to>   
         </rule>   
         <rule>   
         <note> blog catgory RSS http://blog.csdn.net/pigo/category/42406.xml </note>    
             <from>/u/([a-zA-Z0-9 ]+)/category/([a-zA-Z0- 9 ]+).xml </from>   
             <to>/user/catRSS.jsp?username=$1 &catno=$ 2 </to>   
         </rule>   
          <rule>   
         <note> blog photo catgory   http://blog.csdn.net/pigo/photo/42406.html</note>    
             <from>/u/([a-zA-Z0-9 ]+)/photo/([a-zA-Z0- 9 ]+).html</from>   
             <to>/user/photo.jsp?username=$1 &catno=$ 2 </to>   
         </rule>   
         <rule>   
         <note>blog issue http://blog.csdn.net/pigo/archive/2006/03/23/783904.html</note>    
             <from>/u/([a-zA-Z0-9 ]+)/archive/([ 0 - 9 ]+)/([ 0 - 9 ]+)/([ 0 - 9 ]+)/([a-zA-Z0- 9 ]+).html</from>   
             <to>/user/issue.jsp?username=$1 &blogno=$ 5 </to>   
         </rule>   
         <rule>   
         <note>blogarchive by month http://blog.csdn.net/pigo/archive/2005/08.html </note>    
             <from>/u/([a-zA-Z0-9 ]+)/archive/([ 0 - 9 ]+)/([ 0 - 9 ]+).html</from>   
             <to>/user/archivelist.jsp?username=$1 &year=$ 2 &month=$ 3 </to>   
         </rule>   
         <rule>   
         <note>blogapi by user http://blog.csdn.net/pigo/blogapi.html </note>    
             <from>/u/([a-zA-Z0-9 ]+)/blogapi.html</from>   
             <to>/blogapi/?username=$1 </to>   
         </rule>   
          <rule>   
         <note>blogadmin by user http://blog.csdn.net/pigo/blogadmin.html </note>    
             <from>/u/([a-zA-Z0-9 ]+)/blogadmin.html</from>   
             <to>/admin/index.jsp?username=$1 </to>   
         </rule> 

^[A-Za-z]+$　//匹配由26个英文字母组成的字符串
^[A-Z]+$　//匹配由26个英文字母的大写组成的字符串
^[a-z]+$　//匹配由26个英文字母的小写组成的字符串
^[A-Za-z0-9]+$　//匹配由数字和26个英文字母组成的字符串
^/w+$　//匹配由数字、26个英文字母或者下划线组成的字符串

实际上在ISAPI Rewrite中使用最多的两个正则表达式就是代表匹配字幕和数字的([a-z0-9/_]+)以及代表数字的([0-9]+)，只要灵活的掌握这两点，并且按照上面的公式去套用的话，正则表达式并不是一件难办的事。