如何提取html中标签的属性值？

eg:下面是html中的部分，现在需要提取每个<LI><SPAN class="userPic"><A> </A></SPAN></LI>中的title和href的属性值，例如第一个为 : 郎咸平       langxianping  ，请问如何操作？

<LI class="userList t2">
            <EM class="ico_num">1</EM>
            <EM class="ico_state "></EM>
            <SPAN class="userPic">
              <A title="郎咸平(@郎咸平") href="/langxianping" rel="郎咸平(@郎咸平") 1333183314493="1" card="1" ctype="2">
                <IMG alt="郎咸平(@郎咸平") src="http://t2.qlogo.cn/mbloghead/30cea038dd2a3fd8dae0/40">
              </A>
            </SPAN>
            <SPAN class="userName">
              <A title="郎咸平(@郎咸平") href="/langxianping" rel="郎咸平(@郎咸平") 1333183314493="51" card="1" ctype="2">郎咸平</A>
            </SPAN>
            <SPAN class="topData">17154863</SPAN>
            <SPAN class="pint">郎咸平，美国宾西法尼亚大学沃顿商学院博士，现任香港中...</SPAN>
            <DIV class="attentBox">
              <INPUT style="DISPLAY: none" class="addAttention" value="收听"<i class=\'l\'></i>" type=button><A class='delAttention' href="http://t.qq.com/rank.php?id=5&p=1#">
                取消<I class="l"></I>
              </A><A class="delAttention" href="#">
                取消<I class="\'l\'"></I>
              </A>
            </DIV>
          </LI>
          <LI class="userList t2">
            <EM class="ico_num">2</EM>
            <EM class="ico_state "></EM>
            <SPAN class="userPic">
              <A title="任志强(@任志强") href="/renzhiqiang" rel="任志强(@任志强") 1333183314493="2" card="1" ctype="2">
                <IMG alt="任志强(@任志强") src="http://t3.qlogo.cn/mbloghead/43d038e3bcf59c7f09b8/40">
              </A>
            </SPAN>
            <SPAN class="userName">
              <A title="任志强(@任志强") href="/renzhiqiang" rel="任志强(@任志强") 1333183314493="52" card="1" ctype="2">任志强</A>
            </SPAN>
            <SPAN class="topData">7978901</SPAN>
            <SPAN class="pint">任志强，北京市政协委员，现任华远地产股份有限公司董事...</SPAN>
            <DIV class="attentBox">
              <INPUT style="DISPLAY: none" class="addAttention" value="收听"<i class=\'l\'></i>" type=button><A class='delAttention' href="http://t.qq.com/rank.php?id=5&p=1#">
                取消<I class="l"></I>
              </A><A class="delAttention" href="#">
                取消<I class="\'l\'"></I>
              </A>
            </DIV>
          </LI>

解决方案 »

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        static void Main(string[] args)
        {
            string htmlStr = @"你的HTML代码";
            Regex re = new Regex(@"(?is)<LI[^>]+>.*?<SPAN\s*class=""userPic"">\s*<a\s*title=""([^""]+)""\)\s*href=""([^""]+)"".*?</LI>", RegexOptions.None);
            MatchCollection mc = re.Matches(htmlStr);
            foreach (Match ma in mc)
            {
                Console.WriteLine(ma.Groups[1].Value);
                Console.WriteLine(ma.Groups[2].Value);
            }
            Console.ReadLine();
        }
//结果：郎咸平(@郎咸平  /langxianping
//      任志强(@任志强  /renzhiqiang
        static void Main(string[] args)
        {
            string htmlStr = @"你的HTML代码";
            Regex re = new Regex(@"(?is)<LI[^>]+>.*?<SPAN\s*class=""userPic"">\s*<a\s*title=""([^$]+)\(@[^""]+""$\s*href=""/([^""]+)"".*?</LI>", RegexOptions.IgnoreCase);
            MatchCollection mc = re.Matches(htmlStr);
            foreach (Match ma in mc)
            {
                Console.WriteLine(ma.Groups[1].Value);
                Console.WriteLine(ma.Groups[2].Value);
            }
            Console.ReadLine();
        }
//结果：郎咸平  langxianping
//      任志强 renzhiqiang
刚刚我试了一下，不行样，该段html代码前还有一段，如下：<DIV class=w_head_outer>
<DIV class=headWrap>
<DIV id=header class=headInside>
<H1><A accessKey=z title=t.qq.com onmousedown="MI.Bos('btnClickNewLogo')" href="http://t.qq.com/sky_2011_sky">腾讯微博</A> </H1>
<UL class=topNav>
<LI class=topNavItem><A href="http://t.qq.com/sky_2011_sky"><U>首页</U><I></I></A> </LI>
<LI class=topNavItem><A href="http://t.qq.com/c/default"><U style="PADDING-RIGHT: 15px">广场</U><I></I></A><SUP class=ico_new_sr></SUP> </LI>
<LI class="topNavItem groups"><A onmousedown="MI.Bos('btnTopMenuGroup')" href="http://qun.t.qq.com"><U>微群<EM> </EM></U><I></I></A>
<DIV style="POSITION: absolute; WIDTH: 310px; DISPLAY: none; TOP: 100%; LEFT: 0px" class="topNavSub lay_topdrop_qun"><BR><BR><BR><BR></DIV></LI>
<LI class=topNavItem><A class=active href="http://t.qq.com/people"><U>找人</U><I></I></A> </LI>
<LI id=app class="topNavItem apps"><A onmousedown="MI.Bos('btnTopMenuApp')" href="http://app.t.qq.com"><U>应用<EM> </EM></U><I></I></A>
<DIV style="DISPLAY: none; TOP: 100%; LEFT: 0px" class=topNavSub>
<DIV class="itemBox clear"><BR><BR><BR><BR></DIV>
<DIV class=func>
<DIV class=clear>
<P class=right><A href="http://app.t.qq.com/" target=_blank>应用频道<SPAN class=ffsong>>></SPAN></A></P>
<P class=left><A href="http://app.t.qq.com/?g=2" target=_blank>进入我的应用</A></P></DIV></DIV></DIV></LI>
<LI class=topNavItem><A href="http://p.t.qq.com/client.php?t=mobile"><U>手机</U><I></I></A> </LI></UL>
<UL class="topNav right">
<LI style="DISPLAY: none" class="topNavItem countItem topNavMsg"><A class="defaultCur txt" title=消息 href="#"><U><STRONG>0</STRONG></U><I></I></A> </LI>
<LI id=topNav1 class="topNavItem accountItem"><A class=txt title=杨显(@sky_2011_sky) onclick="if(document.body.className.indexOf('ipad') != -1){this.nextSibling.style.display='block';this.className+=' active';return false}" href="http://t.qq.com/sky_2011_sky?preview"><U>杨显<EM> </EM></U><I></I></A>
<UL style="DISPLAY: none" class=topNavSub>
<LI><A onmousedown="MI.Bos('btn_settingNewNav');" href="http://t.qq.com/setting">设置</A> </LI>
<LI><A id=setTheme title=皮肤设置 onmousedown="window.scrollTo(0,0);MI.Bos('btn_themeNewNav');" href="#">换肤</A> </LI>
<LI><A href="http://t.qq.com/help.php">帮助</A> </LI>
<LI><A href="http://t.qq.com/logout.php">退出</A> </LI></UL></LI></UL>
<DIV class=tSearchNew>
<FORM id=searchForm method=get action=http://t.qq.com/search/index.php><LABEL for=searchKey>搜名字/帐号/广播</LABEL><INPUT accessKey=s id=searchKey class=inputTxtNew maxLength=50 name=k autocomplete="off"> <INPUT value=174 type=hidden name=pos> <INPUT class=inputBtn value=搜索 type=submit> <A class=btn_ldrop href="#"><EM></EM></A></FORM></DIV>
<DIV id=nav_pub_wrap class=nav_pub_wrap><A class=btn_nav_pub title=写微博 href="#"><EM class=nav_pub_btn>写微博</EM><B class=nav_pub_bg1></B><B class=nav_pub_bg2></B> </A></DIV></DIV><A style="Z-INDEX: 101; POSITION: absolute; FONT-SIZE: 14px; TOP: 7px; RIGHT: 20px" id=testVersion class=testVersion onclick=" MI.Bos('btn_gotoNano_Level3Blow'); " href="http://1.t.qq.com">体验版<SPAN class=ico_new_sr><EM></EM></SPAN></A>
<DIV class=headShadow></DIV></DIV></DIV>
<DIV id=topWrap>
<DIV id=mainWrapper class=whiteBg>
<DIV class=navArr><EM></EM></DIV>
<DIV class=tabStyle2>
<UL>
<LI><A onclick="MI.Bos('btnPeopleTab1')" href="/find/friends.php">寻找朋友</A> </LI>
<LI><A onclick="MI.Bos('btnPeopleTab2')" href="/find/interest.php">可能感兴趣</A> </LI>
<LI><A onclick="MI.Bos('btnPeopleTab3')" href="/people.php">认证用户</A> </LI>
<LI class=select><B>排行榜</B> </LI>
<LI><A href="/find/search.php">高级搜索</A> </LI></UL>
<DIV class=shareSearch>
<FORM id=f1 onsubmit="if($('schPut').value == '输入姓名/帐号') $('schPut').value = '';" method=get action=/search/user.php><INPUT id=schPut class=inputTxt title=输入姓名/帐号 value=输入姓名/帐号 maxLength=50 name=k autocomplete="off"> <INPUT value=601 type=hidden name=pos> <SPAN class=atbtn><INPUT class=btn_search2 type=submit></SPAN> </FORM></DIV></DIV>
<DIV class=subTab1><A href="/rank.php">首页</A> <A href="/rank.php?id=0">全部</A> <A href="/rank.php?id=4">娱乐</A> <A href="/rank.php?id=1">体育</A> <A class=cur href="/rank.php?id=5">财经</A> <A href="/rank.php?id=2">文化</A> <A href="/rank.php?id=12">媒体人</A> <A href="/rank.php?id=13">媒体机构</A> <A href="/rank.php?id=16">公共名人</A> <A href="/rank.php?id=8">时尚</A> <A href="/rank.php?id=3">汽车</A> <A href="/rank.php?id=10">科技</A> <A href="/rank.php?id=17">营销</A> <A href="/rank.php?id=14">政府机构</A> <A href="/rank.php?id=15">公务人员</A> <A href="/rank.php?id=6">动漫</A> <A href="/rank.php?id=11">游戏</A> <A href="/rank.php?id=7">星座</A> <A href="/rank.php?id=9">教育</A> <A href="/rank.php?id=18">企业</A> <A href="/rank.php?id=19">草根</A> <SPAN class=bg></SPAN></DIV>
<DIV class="topWrap clear">
<DIV class=topListBox>
<H3><SPAN class=topTitle>财经热度总榜</SPAN> <SPAN class="topTit lnum">听众总数</SPAN><SPAN class="topTit pint">人物介绍</SPAN><SPAN class="topTit opt"></SPAN></H3>
<OL class="topList topTotal">
static void Main(string[] args)
        {
            string htmlStr = @"你的HTML代码";
            Regex re = new Regex(@"(?is)<LI\s*class=""userList t2"">.*?<SPAN\s*class=""userPic"">\s*<a\s*title=""([^$]+)\(@[^""]+""$\s*href=""/([^""]+)"".*?</LI>", RegexOptions.None);
            MatchCollection mc = re.Matches(htmlStr);
            foreach (Match ma in mc)
            {
                Console.WriteLine(ma.Groups[1].Value);
                Console.WriteLine(ma.Groups[2].Value);
            }
            Console.ReadLine();
        }
我测试了一下，可以的啊
C盘建了一个1.txt<DIV class=w_head_outer>
<DIV class=headWrap>
<DIV id=header class=headInside>
<H1><A accessKey=z title=t.qq.com onmousedown="MI.Bos('btnClickNewLogo')" href="http://t.qq.com/sky_2011_sky">腾讯微博</A> </H1>
<UL class=topNav>
<LI class=topNavItem><A href="http://t.qq.com/sky_2011_sky"><U>首页</U><I></I></A> </LI>
<LI class=topNavItem><A href="http://t.qq.com/c/default"><U style="PADDING-RIGHT: 15px">广场</U><I></I></A><SUP class=ico_new_sr></SUP> </LI>
<LI class="topNavItem groups"><A onmousedown="MI.Bos('btnTopMenuGroup')" href="http://qun.t.qq.com"><U>微群<EM> </EM></U><I></I></A>
<DIV style="POSITION: absolute; WIDTH: 310px; DISPLAY: none; TOP: 100%; LEFT: 0px" class="topNavSub lay_topdrop_qun"><BR><BR><BR><BR></DIV></LI>
<LI class=topNavItem><A class=active href="http://t.qq.com/people"><U>找人</U><I></I></A> </LI>
<LI id=app class="topNavItem apps"><A onmousedown="MI.Bos('btnTopMenuApp')" href="http://app.t.qq.com"><U>应用<EM> </EM></U><I></I></A>
<DIV style="DISPLAY: none; TOP: 100%; LEFT: 0px" class=topNavSub>
<DIV class="itemBox clear"><BR><BR><BR><BR></DIV>
<DIV class=func>
<DIV class=clear>
<P class=right><A href="http://app.t.qq.com/" target=_blank>应用频道<SPAN class=ffsong>>></SPAN></A></P>
<P class=left><A href="http://app.t.qq.com/?g=2" target=_blank>进入我的应用</A></P></DIV></DIV></DIV></LI>
<LI class=topNavItem><A href="http://p.t.qq.com/client.php?t=mobile"><U>手机</U><I></I></A> </LI></UL>
<UL class="topNav right">
<LI style="DISPLAY: none" class="topNavItem countItem topNavMsg"><A class="defaultCur txt" title=消息 href="#"><U><STRONG>0</STRONG></U><I></I></A> </LI>
<LI id=topNav1 class="topNavItem accountItem"><A class=txt title=杨显(@sky_2011_sky) onclick="if(document.body.className.indexOf('ipad') != -1){this.nextSibling.style.display='block';this.className+=' active';return false}" href="http://t.qq.com/sky_2011_sky?preview"><U>杨显<EM> </EM></U><I></I></A>
<UL style="DISPLAY: none" class=topNavSub>
<LI><A onmousedown="MI.Bos('btn_settingNewNav');" href="http://t.qq.com/setting">设置</A> </LI>
<LI><A id=setTheme title=皮肤设置 onmousedown="window.scrollTo(0,0);MI.Bos('btn_themeNewNav');" href="#">换肤</A> </LI>
<LI><A href="http://t.qq.com/help.php">帮助</A> </LI>
<LI><A href="http://t.qq.com/logout.php">退出</A> </LI></UL></LI></UL>
<DIV class=tSearchNew>
<FORM id=searchForm method=get action=http://t.qq.com/search/index.php><LABEL for=searchKey>搜名字/帐号/广播</LABEL><INPUT accessKey=s id=searchKey class=inputTxtNew maxLength=50 name=k autocomplete="off"> <INPUT value=174 type=hidden name=pos> <INPUT class=inputBtn value=搜索 type=submit> <A class=btn_ldrop href="#"><EM></EM></A></FORM></DIV>
<DIV id=nav_pub_wrap class=nav_pub_wrap><A class=btn_nav_pub title=写微博 href="#"><EM class=nav_pub_btn>写微博</EM><B class=nav_pub_bg1></B><B class=nav_pub_bg2></B> </A></DIV></DIV><A style="Z-INDEX: 101; POSITION: absolute; FONT-SIZE: 14px; TOP: 7px; RIGHT: 20px" id=testVersion class=testVersion onclick=" MI.Bos('btn_gotoNano_Level3Blow'); " href="http://1.t.qq.com">体验版<SPAN class=ico_new_sr><EM></EM></SPAN></A>
<DIV class=headShadow></DIV></DIV></DIV>
<DIV id=topWrap>
<DIV id=mainWrapper class=whiteBg>
<DIV class=navArr><EM></EM></DIV>
<DIV class=tabStyle2>
<UL>
<LI><A onclick="MI.Bos('btnPeopleTab1')" href="/find/friends.php">寻找朋友</A> </LI>
<LI><A onclick="MI.Bos('btnPeopleTab2')" href="/find/interest.php">可能感兴趣</A> </LI>
<LI><A onclick="MI.Bos('btnPeopleTab3')" href="/people.php">认证用户</A> </LI>
<LI class=select><B>排行榜</B> </LI>
<LI><A href="/find/search.php">高级搜索</A> </LI></UL>
<DIV class=shareSearch>
<FORM id=f1 onsubmit="if($('schPut').value == '输入姓名/帐号') $('schPut').value = '';" method=get action=/search/user.php><INPUT id=schPut class=inputTxt title=输入姓名/帐号 value=输入姓名/帐号 maxLength=50 name=k autocomplete="off"> <INPUT value=601 type=hidden name=pos> <SPAN class=atbtn><INPUT class=btn_search2 type=submit></SPAN> </FORM></DIV></DIV>
<DIV class=subTab1><A href="/rank.php">首页</A> <A href="/rank.php?id=0">全部</A> <A href="/rank.php?id=4">娱乐</A> <A href="/rank.php?id=1">体育</A> <A class=cur href="/rank.php?id=5">财经</A> <A href="/rank.php?id=2">文化</A> <A href="/rank.php?id=12">媒体人</A> <A href="/rank.php?id=13">媒体机构</A> <A href="/rank.php?id=16">公共名人</A> <A href="/rank.php?id=8">时尚</A> <A href="/rank.php?id=3">汽车</A> <A href="/rank.php?id=10">科技</A> <A href="/rank.php?id=17">营销</A> <A href="/rank.php?id=14">政府机构</A> <A href="/rank.php?id=15">公务人员</A> <A href="/rank.php?id=6">动漫</A> <A href="/rank.php?id=11">游戏</A> <A href="/rank.php?id=7">星座</A> <A href="/rank.php?id=9">教育</A> <A href="/rank.php?id=18">企业</A> <A href="/rank.php?id=19">草根</A> <SPAN class=bg></SPAN></DIV>
<DIV class="topWrap clear">
<DIV class=topListBox>
<H3><SPAN class=topTitle>财经热度总榜</SPAN> <SPAN class="topTit lnum">听众总数</SPAN><SPAN class="topTit pint">人物介绍</SPAN><SPAN class="topTit opt"></SPAN></H3>
<OL class="topList topTotal">
<LI class="userList t2">
            <EM class="ico_num">1</EM>
            <EM class="ico_state "></EM>
            <SPAN class="userPic">
              <A title="郎咸平(@郎咸平") href="/langxianping" rel="郎咸平(@郎咸平") 1333183314493="1" card="1" ctype="2">
                <IMG alt="郎咸平(@郎咸平") src="http://t2.qlogo.cn/mbloghead/30cea038dd2a3fd8dae0/40">
              </A>
            </SPAN>
  <SPAN class="userName">
              <A title="郎咸平(@郎咸平") href="/langxianping" rel="郎咸平(@郎咸平") 1333183314493="51" card="1" ctype="2">郎咸平</A>
            </SPAN>
            <SPAN class="topData">17154863</SPAN>
            <SPAN class="pint">郎咸平，美国宾西法尼亚大学沃顿商学院博士，现任香港中...</SPAN>
            <DIV class="attentBox">
              <INPUT style="DISPLAY: none" class="addAttention" value="收听"<i class=\'l\'></i>" type=button><A class='delAttention' href="http://t.qq.com/rank.php?id=5&p=1#">
                取消<I class="l"></I>
              </A><A class="delAttention" href="#">
                取消<I class="\'l\'"></I>
              </A>
            </DIV>
          </LI>
          <LI class="userList t2">
            <EM class="ico_num">2</EM>
            <EM class="ico_state "></EM>
            <SPAN class="userPic">
              <A title="任志强(@任志强") href="/renzhiqiang" rel="任志强(@任志强") 1333183314493="2" card="1" ctype="2">
                <IMG alt="任志强(@任志强") src="http://t3.qlogo.cn/mbloghead/43d038e3bcf59c7f09b8/40">
              </A>
            </SPAN>
            <SPAN class="userName">
              <A title="任志强(@任志强") href="/renzhiqiang" rel="任志强(@任志强") 1333183314493="52" card="1" ctype="2">任志强</A>
            </SPAN>
            <SPAN class="topData">7978901</SPAN>
            <SPAN class="pint">任志强，北京市政协委员，现任华远地产股份有限公司董事...</SPAN>
            <DIV class="attentBox">
              <INPUT style="DISPLAY: none" class="addAttention" value="收听"<i class=\'l\'></i>" type=button><A class='delAttention' href="http://t.qq.com/rank.php?id=5&p=1#">
                取消<I class="l"></I>
              </A><A class="delAttention" href="#">
                取消<I class="\'l\'"></I>
              </A>
            </DIV>
          </LI>
           string input = File.ReadAllText(@"C:\1.txt", System.Text.Encoding.GetEncoding("GB2312"));
            string pat = @"(?is)<LI\s*class=""userList t2"">.*?<SPAN\s*class=""userPic"">\s*<a\s*title=""([^$]+)\(@[^""]+""$\s*href=""/([^""]+)""(.*?)</LI>";
            MatchCollection matches = Regex.Matches(input, pat);
            Dictionary<string, string> matchstr = new Dictionary<string, string>();
            foreach (Match match in matches)
            {
                matchstr.Add(match.Groups[1].Value, match.Groups[2].Value);
            }
现在的问题是，我用的txt保存的从网页中提取的html,运行不出结果。但是我把该html保存为.xml文件在vs2010中格式化内容后，就可以得到结果，有什么好的方法可以直接运行原来没有格式化的html?
正则不涉及这些东西啊，你html保存txt内容难道和上面的不一样？
JAVASCRIPT  通过document.getElementbyid 可以获得
  然后把控件  加一个  runat=server  通过后台获取
对，txt保存的html没有上面的html有缩进
就是没有空白字符，也是可以的啊，只要没有乱码影响，
(is?)意思是i表示不区分大小写，s所有文本看做单行。\s表示空白字符，比如空格 \r \t这种
\s*表示0个或者多个\s