用正则匹配一些特殊的a标签，求救

要用正则匹配出以域名开头的a标签，或以“/”开头的a标签，但url地址必须以 .aspx 结尾
如：<a href="http://jiancai.xyecom.com/sell-info.aspx">test</a>
<a href="/sell-info.aspx">test</a>以下是程序获取到得部分html代码    <li><a hre
f=\"#\" onclick=\"xy_SelectSearchMenu('品牌','brand','');\">品牌</a></li>\r\n\t\t\t\t\t    <li><a href=\"#\" onclick=\"xy_SelectSearchMenu('展会','exhibition','');\">展会</a></li>\r\n\t\t\t\t\t</ul>\r\n\t\t\t\t</div>\r\n\t\t\t\t<input type=\"hidden\" id=\"xy_FlagName\" value=\"offer\"/>\r\n\t\t\t\t<input type=\"hidden\" id=\"xy_InfoType\" value=\"sell\"/>\r\n\t\t\t\t<button value=\"搜索\" id=\"DoSearch\" name=\"DoSearch\" class=\"btsearch\" onclick=\"xy_search();\"/>搜索</button>\r\n\t\t\t\t<a href=\"/search/advanced_search.aspx\" class=\"black\">[高级搜索]</a>\r\n\t\t\t\t<a href=\"http://jiancai.xyecom.com/contributor.aspx\" class=\"black\">[投稿]</a>\r\n\t\t\t\t<a href=\"http://jiancai.xyecom.com/post.aspx\" class=\"black\">[发布信息]</a>\r\n\t\t\t\t<a href=\"http://jiancai.xyecom.com/baike/index.aspx\" class=\"black\">[百科]</a>\r\n\t\t\t</div>\r\n\t\t\t<div id=\"sch_bnr\"><a href=\"\"><img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_5.jpg\" width=\"170\" height=\"77\" alt=\"\" /></a></div>\r\n\t\t\t<div id=\
"hot_schs\">\r\n\t\t\t\t<ul>\r\n\t\t\t\t\t<li><strong>热门搜索词：</strong></li>\r\n\t\t\t\t\t<li>\r\n\t\t\t\t\t\t<ul>\r\n\t\t\t\t\t\t\t<li><a target=\"_blank\" href=\"/search/seller_search-offer--花花-------.aspx\">花花</a></li><li><a target=\"_blank\" href=\"/search/seller_search-offer--方法-------.aspx\">方法</a></li><li><a target=\"_blank\" href=\"/search/seller_search-offer--huahua-------.aspx\">huahua</a></li><li><a target=\"_blank\" href=\"/search/seller_search-offer--ggf-------.aspx\">ggf</a></li><li><a target=\"_blank\" href=\"/search/seller_search-offer--ggf,r6-------.aspx\">ggf,r6</a></li>\r\n\t\t\t\t\t\t</ul>\r\n\t\t\t\t\t</li>\r\n\t\t\t\t</ul>\r\n\t\t\t</div>\r\n\t\t</div>\r\n\t</div>\r\n        <div id=\"best_cmpy\">\r\n            <ul>\r\n                <li><a href=\"\">\r\n                    <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_1.jpg\" width=\"191\"\r\n                        height=\"62\" alt=\"\" /></a></li>\r\n                <li><a href=\"\">\r\n                    <im
g src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_2.jpg\" width=\"191\"\r\n                        height=\"62\" alt=\"\" /></a></li>\r\n                <li><a href=\"\">\r\n                    <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_3.jpg\" width=\"191\"\r\n                        height=\"62\" alt=\"\" /></a></li>\r\n                <li><a href=\"\">\r\n                    <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_4.jpg\" width=\"191\"\r\n                        height=\"62\" alt=\"\" /></a></li>\r\n                <li><a href=\"\">\r\n                    <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_3.jpg\" width=\"191\"\r\n                        height=\"62\" alt=\"\" /></a></li>\r\n                <li><a href=\"\">\r\n                    <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_4.jpg\" width=\"191\"\r\n                        height=\"62\" alt=\"\" /></a></li>\r\n
      <li><a href=\"\">\r\n                    <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_1.jpg\" width=\"191\"\r\n                        height=\"62\" alt=\"\" /></a></li>\r\n                <li><a href=\"\">\r\n                    <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_2.jpg\" width=\"191\"\r\n                        height=\"62\" alt=\"\" /></a></li>\r\n                <li><a href=\"\">\r\n                    <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_1.jpg\" width=\"191\"\r\n                        height=\"62\" alt=\"\" /></a></li>\r\n                <li><a href=\"\">\r\n                    <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_2.jpg\" width=\"191\"\r\n                        height=\"62\" alt=\"\" /></a></li>\r\n            </ul>\r\n        </div>\r\n        <div id=\"idx_cnt1\">\r\n            <div id=\"left\">\r\n                <div class=\"top spacer\">\r\n                </div>\r
\n                <div class=\"main\">\r\n                    <div class=\"tit\">\r\n                        <h2>\r\n                            <span>热点信息</span></h2>\r\n                    </div>\r\n                    <ul class=\"hinfo-text\">\r\n                        <li><a href=\"http://jiancai.xyecom.com/news/channel-5.aspx\">[营销学院]</a> <a href=\"http://jiancai.xyecom.com/news/content-10.aspx\"><font style=color:#008000;font-weight:bold;font-style:italic;text-decoration:underline>test1323232</font></a></li><li><a href=\"http://jiancai.xyecom.com/news/channel-3.aspx\">[市场分析]</a> <a href=\"http://jiancai.xyecom.com/news/content-8.aspx\">测试测试测试</a></li>\r\n                    </ul>\r\n                    <ul class=\"hinfo-img\">\r\n                        <li><a href=\"#\">\r\n                            <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_6.jpg\" width=\"118\"\r\n                                height=\"42\" alt=\"\" /><span>沈阳市金山技术有限公司</span></a></li>\r\n
          <li><a href=\"#\" class=\"orange\">\r\n                            <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_7.jpg\" width=\"118\"\r\n                                height=\"42\" alt=\"\" /><span>华北造纸生产基地</span></a></li>\r\n                    </ul>\r\n                    <div class=\"clr\">\r\n                    </div>\r\n                </div>\r\n                <div class=\"btm spacer\">\r\n                </div>\r\n            </div>\r\n            <div id=\"mid\">\r\n                <a href=\"\">\r\n                    <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_bnr_2.jpg\" width=\"360\"\r\n                        height=\"194\" alt=\"\" /></a>\r\n            </div>\r\n            <div id=\"right\">\r\n\t\r\n\t<div class=\"B_8 r\" style=\"display:none;\"  id=\"xy_login_nologin\">\r\n\t\t<div class=\"B_8\">\r\n\t\t\t<div class=\"B_9\">立即登录</div>\r\n\t\t\t<div class=\"B_10\"><a class=\"white\" href=\"http://jiancai.xyecom.com/user\"
>进入商务管理后台</a></div>\r\n\t\t</div>\r\n\t\t<div class=\"B_11_2 clr\">\r\n\t\t\t<div class=\"B_12\">\r\n\t\t\t\t<div class=\"B_12\">\r\n\t\t\t\t\t<div class=\"B_13\">用户名：</div>\r\n\t\t\t\t\t<div class=\"B_15\"><input type=\"text\" tabindex=\"1\" class=\"tf1\" name=\"_lbox_username\" id=\"_lbox_username\" onkeydown =\"_xy_KeyPress('_btnBoxLogin');\"/></div>\r\n\t\t\t\t</div>\r\n\t\t\t\t<div class=\"B_12\">\r\n\t\t\t\t\t<div class=\"B_13\">密   码：</div>\r\n\t\t\t\t\t<div class=\"B_15\"><input type=\"password\" tabindex=\"2\" class=\"tf1\" name=\"_lbox_password\" id=\"_lbox_password\" onkeydown =\"_xy_KeyPress('_btnBoxLogin');\"/></div>\r\n\t\t\t\t</div>\r\n\t\t\t\t<div class=\"B_16 clr\" style=\"padding-top:5px;\">\r\n\t\t\t\t    <input id=\"_btnBoxLogin\" height=\"29\" width=\"108\" type=\"image\" src=\"http://jiancai.xyecom.com/templates/default/images/dabn6.gif\" onclick=\"return xy_BoxLogin();\"/> \r\n\t\t\t\t    <a href=\"http://jiancai.xyecom.com/getpassword.aspx\">忘记密码？</a>\r\n\t\t\t\t</div>\r\n\t\t\t</div>\r
\n\t\t\t<div class=\"login_links\">\r\n\t\t\t\t<ul class=\"service\">\r\n\t\t\t\t\t<li class=\"s_1\"><a href=\"http://jiancai.xyecom.com/user/\"><strong>发布信息</strong></a></li>\r\n\t\t\t\t\t<li class=\"s_2\"><a href=\"http://jiancai.xyecom.com/register.aspx\"><strong>注册会员</strong></a></li>\r\n\t\t\t\t</ul>\r\n\t\t\t\t<div class=\"clr\"></div>\r\n\t\t\t</div>\r\n\t\t</div>\r\n\t</div>\r\n    \r\n\t<div class=\"B_8 r\" id=\"xy_login_logined\">\r\n\t\t<div class=\"B_8\">\r\n\t\t\t<div class=\"B_9\">欢迎登录</div>\r\n\t\t\t<div class=\"B_10\"><a class=\"white\" href=\"\" id=\"_lbox_ucenter\">进入商务管理后台</a></div>\r\n\t\t</div>\r\n\t\t<div class=\"B_11 clr\">\r\n\t\t\t<div class=\"E_1\"><font class=\"huei14\">欢迎您！</font> <span id=\"_lbox_uname\"></span> [<a target=\"_self\" class=\"hui12i\" href=\"http://jiancai.xyecom.com/logout.aspx\">退出</a>]</div>\r\n\t\t\t<div class=\"B_12 clr\">\r\n\t\t\t\t<div class=\"E_6\"><a href=\"http://jiancai.xyecom.com/user/infoselect.aspx\">发布产品</a> | <a href=\"http://jiancai.xyec
om.com/user/addnews.aspx\">发布资讯</a> | <a href=\"http://jiancai.xyecom.com/user/receivemessagelist.aspx\">我的留言</a></div>\r\n\t\t\t\t<div style=\"padding-top:20px;padding-left: 37px;\" class=\"E_6 mt10\"><a href=\"/user/\

解决方案 »

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void Main()
{
string str="<li><a href=\"#\" onclick=\"xy_SelectSearchMenu('品牌','brand','');\">品牌</a></li>\r\n\t\t\t\t\t <li><a href=\"#\" onclick=\"xy_SelectSearchMenu('展会','exhibition','');\">展会</a></li>\r\n\t\t\t\t\t</ul>\r\n\t\t\t\t</div>\r\n\t\t\t\t<input type=\"hidden\" id=\"xy_FlagName\" value=\"offer\"/>\r\n\t\t\t\t<input type=\"hidden\" id=\"xy_InfoType\" value=\"sell\"/>\r\n\t\t\t\t<button value=\"搜索\" id=\"DoSearch\" name=\"DoSearch\" class=\"btsearch\" onclick=\"xy_search();\"/>搜索</button>\r\n\t\t\t\t<a href=\"/search/advanced_search.aspx\" class=\"black\">[高级搜索]</a>\r\n\t\t\t\t<a href=\"http://jiancai.xyecom.com/contributor.aspx\" class=\"black\">[投稿]</a>\r\n\t\t\t\t<a href=\"http://jiancai.xyecom.com/post.aspx\" class=\"black\">[发布信息]</a>\r\n\t\t\t\t<a href=\"http://jiancai.xyecom.com/baike/index.aspx\" class=\"black\">[百科]</a>\r\n\t\t\t</div>\r\n\t\t\t<div id=\"sch_bnr\"><a href=\"\"><img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_5.jpg\" width=\"170\" height=\"77\" alt=\"\" /></a></div>\r\n\t\t\t<div id=\"hot_schs\">\r\n\t\t\t\t<ul>\r\n\t\t\t\t\t<li><strong>热门搜索词：</strong></li>\r\n\t\t\t\t\t<li>\r\n\t\t\t\t\t\t<ul>\r\n\t\t\t\t\t\t\t<li><a target=\"_blank\" href=\"/search/seller_search-offer--花花-------.aspx\">花花</a></li><li><a target=\"_blank\" href=\"/search/seller_search-offer--方法-------.aspx\">方法</a></li><li><a target=\"_blank\" href=\"/search/seller_search-offer--huahua-------.aspx\">huahua</a></li><li><a target=\"_blank\" href=\"/search/seller_search-offer--ggf-------.aspx\">ggf</a></li><li><a target=\"_blank\" href=\"/search/seller_search-offer--ggf,r6-------.aspx\">ggf,r6</a></li>\r\n\t\t\t\t\t\t</ul>\r\n\t\t\t\t\t</li>\r\n\t\t\t\t</ul>\r\n\t\t\t</div>\r\n\t\t</div>\r\n\t</div>\r\n <div id=\"best_cmpy\">\r\n <ul>\r\n <li><a href=\"\">\r\n <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_1.jpg\" width=\"191\"\r\n height=\"62\" alt=\"\" /></a></li>\r\n <li><a href=\"\">\r\n <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_2.jpg\" width=\"191\"\r\n height=\"62\" alt=\"\" /></a></li>\r\n <li><a href=\"\">\r\n <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_3.jpg\" width=\"191\"\r\n height=\"62\" alt=\"\" /></a></li>\r\n <li><a href=\"\">\r\n <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_4.jpg\" width=\"191\"\r\n height=\"62\" alt=\"\" /></a></li>\r\n <li><a href=\"\">\r\n <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_3.jpg\" width=\"191\"\r\n height=\"62\" alt=\"\" /></a></li>\r\n <li><a href=\"\">\r\n <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_4.jpg\" width=\"191\"\r\n height=\"62\" alt=\"\" /></a></li>\r\n   <li><a href=\"\">\r\n <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_1.jpg\" width=\"191\"\r\n height=\"62\" alt=\"\" /></a></li>\r\n <li><a href=\"\">\r\n <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_2.jpg\" width=\"191\"\r\n height=\"62\" alt=\"\" /></a></li>\r\n <li><a href=\"\">\r\n <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_1.jpg\" width=\"191\"\r\n height=\"62\" alt=\"\" /></a></li>\r\n <li><a href=\"\">\r\n <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_2.jpg\" width=\"191\"\r\n height=\"62\" alt=\"\" /></a></li>\r\n </ul>\r\n </div>\r\n <div id=\"idx_cnt1\">\r\n <div id=\"left\">\r\n <div class=\"top spacer\">\r\n </div>\r\n <div class=\"main\">\r\n <div class=\"tit\">\r\n <h2>\r\n <span>热点信息</span></h2>\r\n </div>\r\n <ul class=\"hinfo-text\">\r\n <li><a href=\"http://jiancai.xyecom.com/news/channel-5.aspx\">[营销学院]</a> <a href=\"http://jiancai.xyecom.com/news/content-10.aspx\"><font style=color:#008000;font-weight:bold;font-style:italic;text-decoration:underline>test1323232</font></a></li><li><a href=\"http://jiancai.xyecom.com/news/channel-3.aspx\">[市场分析]</a> <a href=\"http://jiancai.xyecom.com/news/content-8.aspx\">测试测试测试</a></li>\r\n </ul>\r\n <ul class=\"hinfo-img\">\r\n <li><a href=\"#\">\r\n <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_6.jpg\" width=\"118\"\r\n height=\"42\" alt=\"\" /><span>沈阳市金山技术有限公司</span></a></li>\r\n   <li><a href=\"#\" class=\"orange\">\r\n <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_7.jpg\" width=\"118\"\r\n height=\"42\" alt=\"\" /><span>华北造纸生产基地</span></a></li>\r\n </ul>\r\n <div class=\"clr\">\r\n </div>\r\n </div>\r\n <div class=\"btm spacer\">\r\n </div>\r\n </div>\r\n <div id=\"mid\">\r\n <a href=\"\">\r\n <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_bnr_2.jpg\" width=\"360\"\r\n height=\"194\" alt=\"\" /></a>\r\n </div>\r\n <div id=\"right\">\r\n\t\r\n\t<div class=\"B_8 r\" style=\"display:none;\" id=\"xy_login_nologin\">\r\n\t\t<div class=\"B_8\">\r\n\t\t\t<div class=\"B_9\">立即登录</div>\r\n\t\t\t<div class=\"B_10\"><a class=\"white\" href=\"http://jiancai.xyecom.com/user\">进入商务管理后台</a></div>\r\n\t\t</div>\r\n\t\t<div class=\"B_11_2 clr\">\r\n\t\t\t<div class=\"B_12\">\r\n\t\t\t\t<div class=\"B_12\">\r\n\t\t\t\t\t<div class=\"B_13\">用户名：</div>\r\n\t\t\t\t\t<div class=\"B_15\"><input type=\"text\" tabindex=\"1\" class=\"tf1\" name=\"_lbox_username\" id=\"_lbox_username\" onkeydown =\"_xy_KeyPress('_btnBoxLogin');\"/></div>\r\n\t\t\t\t</div>\r\n\t\t\t\t<div class=\"B_12\">\r\n\t\t\t\t\t<div class=\"B_13\">密码：</div>\r\n\t\t\t\t\t<div class=\"B_15\"><input type=\"password\" tabindex=\"2\" class=\"tf1\" name=\"_lbox_password\" id=\"_lbox_password\" onkeydown =\"_xy_KeyPress('_btnBoxLogin');\"/></div>\r\n\t\t\t\t</div>\r\n\t\t\t\t<div class=\"B_16 clr\" style=\"padding-top:5px;\">\r\n\t\t\t\t <input id=\"_btnBoxLogin\" height=\"29\" width=\"108\" type=\"image\" src=\"http://jiancai.xyecom.com/templates/default/images/dabn6.gif\" onclick=\"return xy_BoxLogin();\"/> \r\n\t\t\t\t <a href=\"http://jiancai.xyecom.com/getpassword.aspx\">忘记密码？</a>\r\n\t\t\t\t</div>\r\n\t\t\t</div>\r\n\t\t\t<div class=\"login_links\">\r\n\t\t\t\t<ul class=\"service\">\r\n\t\t\t\t\t<li class=\"s_1\"><a href=\"http://jiancai.xyecom.com/user/\"><strong>发布信息</strong></a></li>\r\n\t\t\t\t\t<li class=\"s_2\"><a href=\"http://jiancai.xyecom.com/register.aspx\"><strong>注册会员</strong></a></li>\r\n\t\t\t\t</ul>\r\n\t\t\t\t<div class=\"clr\"></div>\r\n\t\t\t</div>\r\n\t\t</div>\r\n\t</div>\r\n \r\n\t<div class=\"B_8 r\" id=\"xy_login_logined\">\r\n\t\t<div class=\"B_8\">\r\n\t\t\t<div class=\"B_9\">欢迎登录</div>\r\n\t\t\t<div class=\"B_10\"><a class=\"white\" href=\"\" id=\"_lbox_ucenter\">进入商务管理后台</a></div>\r\n\t\t</div>\r\n\t\t<div class=\"B_11 clr\">\r\n\t\t\t<div class=\"E_1\"><font class=\"huei14\">欢迎您！</font> <span id=\"_lbox_uname\"></span> [<a target=\"_self\" class=\"hui12i\" href=\"http://jiancai.xyecom.com/logout.aspx\">退出</a>]</div>\r\n\t\t\t<div class=\"B_12 clr\">\r\n\t\t\t\t<div class=\"E_6\"><a href=\"http://jiancai.xyecom.com/user/infoselect.aspx\">发布产品</a> | <a href=\"http://jiancai.xyecom.com/user/addnews.aspx\">发布资讯</a> | <a href=\"http://jiancai.xyecom.com/user/receivemessagelist.aspx\">我的留言</a></div>\r\n\t\t\t\t<div style=\"padding-top:20px;padding-left: 37px;\" class=\"E_6 mt10\"><a href=\"/user/\"";
    foreach(Match m in Regex.Matches(str,@"(?i)<a[^>]*href=([""'])?[^""']+\.aspx\1[^>]*>[^<>]*</a>"))
{
   Console.WriteLine(m.Value);
}
/*
<a href="/search/advanced_search.aspx" class="black">[高级搜索]</a>
<a href="http://jiancai.xyecom.com/contributor.aspx" class="black">[投稿]</a>
<a href="http://jiancai.xyecom.com/post.aspx" class="black">[发布信息]</a>
<a href="http://jiancai.xyecom.com/baike/index.aspx" class="black">[百科]</a>
<a target="_blank" href="/search/seller_search-offer--花花-------.aspx">花花</a>
<a target="_blank" href="/search/seller_search-offer--方法-------.aspx">方法</a>
<a target="_blank" href="/search/seller_search-offer--huahua-------.aspx">huahua</a>
<a target="_blank" href="/search/seller_search-offer--ggf-------.aspx">ggf</a>
<a target="_blank" href="/search/seller_search-offer--ggf,r6-------.aspx">ggf,r6</a>
<a href="http://jiancai.xyecom.com/news/channel-5.aspx">[营销学院]</a>
<a href="http://jiancai.xyecom.com/news/channel-3.aspx">[市场分析]</a>
<a href="http://jiancai.xyecom.com/news/content-8.aspx">测试测试测试</a>
<a href="http://jiancai.xyecom.com/getpassword.aspx">忘记密码？</a>
<a target="_self" class="hui12i" href="http://jiancai.xyecom.com/logout.aspx">退出</a>
<a href="http://jiancai.xyecom.com/user/infoselect.aspx">发布产品</a>
<a href="http://jiancai.xyecom.com/user/addnews.aspx">发布资讯</a>
<a href="http://jiancai.xyecom.com/user/receivemessagelist.aspx">我的留言</a>
*/
}
如果为了过滤其他站上的url 而只要http://jiancai.xyecom.com 域名下的url，或者以“/”开头的url，切url后缀有可能是html,aspx,改怎么写呢？
对不起，我正则太差劲了，
void Main()
{
string str="<li><a href=\"#\" onclick=\"xy_SelectSearchMenu('品牌','brand','');\">品牌</a></li>\r\n\t\t\t\t\t <li><a href=\"#\" onclick=\"xy_SelectSearchMenu('展会','exhibition','');\">展会</a></li>\r\n\t\t\t\t\t</ul>\r\n\t\t\t\t</div>\r\n\t\t\t\t<input type=\"hidden\" id=\"xy_FlagName\" value=\"offer\"/>\r\n\t\t\t\t<input type=\"hidden\" id=\"xy_InfoType\" value=\"sell\"/>\r\n\t\t\t\t<button value=\"搜索\" id=\"DoSearch\" name=\"DoSearch\" class=\"btsearch\" onclick=\"xy_search();\"/>搜索</button>\r\n\t\t\t\t<a href=\"/search/advanced_search.aspx\" class=\"black\">[高级搜索]</a>\r\n\t\t\t\t<a href=\"http://jiancai.xyecom.com/contributor.aspx\" class=\"black\">[投稿]</a>\r\n\t\t\t\t<a href=\"http://jiancai.xyecom.com/post.aspx\" class=\"black\">[发布信息]</a>\r\n\t\t\t\t<a href=\"http://jiancai.xyecom.com/baike/index.aspx\" class=\"black\">[百科]</a>\r\n\t\t\t</div>\r\n\t\t\t<div id=\"sch_bnr\"><a href=\"\"><img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_5.jpg\" width=\"170\" height=\"77\" alt=\"\" /></a></div>\r\n\t\t\t<div id=\"hot_schs\">\r\n\t\t\t\t<ul>\r\n\t\t\t\t\t<li><strong>热门搜索词：</strong></li>\r\n\t\t\t\t\t<li>\r\n\t\t\t\t\t\t<ul>\r\n\t\t\t\t\t\t\t<li><a target=\"_blank\" href=\"/search/seller_search-offer--花花-------.aspx\">花花</a></li><li><a target=\"_blank\" href=\"/search/seller_search-offer--方法-------.aspx\">方法</a></li><li><a target=\"_blank\" href=\"/search/seller_search-offer--huahua-------.aspx\">huahua</a></li><li><a target=\"_blank\" href=\"/search/seller_search-offer--ggf-------.aspx\">ggf</a></li><li><a target=\"_blank\" href=\"/search/seller_search-offer--ggf,r6-------.aspx\">ggf,r6</a></li>\r\n\t\t\t\t\t\t</ul>\r\n\t\t\t\t\t</li>\r\n\t\t\t\t</ul>\r\n\t\t\t</div>\r\n\t\t</div>\r\n\t</div>\r\n <div id=\"best_cmpy\">\r\n <ul>\r\n <li><a href=\"\">\r\n <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_1.jpg\" width=\"191\"\r\n height=\"62\" alt=\"\" /></a></li>\r\n <li><a href=\"\">\r\n <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_2.jpg\" width=\"191\"\r\n height=\"62\" alt=\"\" /></a></li>\r\n <li><a href=\"\">\r\n <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_3.jpg\" width=\"191\"\r\n height=\"62\" alt=\"\" /></a></li>\r\n <li><a href=\"\">\r\n <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_4.jpg\" width=\"191\"\r\n height=\"62\" alt=\"\" /></a></li>\r\n <li><a href=\"\">\r\n <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_3.jpg\" width=\"191\"\r\n height=\"62\" alt=\"\" /></a></li>\r\n <li><a href=\"\">\r\n <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_4.jpg\" width=\"191\"\r\n height=\"62\" alt=\"\" /></a></li>\r\n   <li><a href=\"\">\r\n <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_1.jpg\" width=\"191\"\r\n height=\"62\" alt=\"\" /></a></li>\r\n <li><a href=\"\">\r\n <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_2.jpg\" width=\"191\"\r\n height=\"62\" alt=\"\" /></a></li>\r\n <li><a href=\"\">\r\n <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_1.jpg\" width=\"191\"\r\n height=\"62\" alt=\"\" /></a></li>\r\n <li><a href=\"\">\r\n <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_2.jpg\" width=\"191\"\r\n height=\"62\" alt=\"\" /></a></li>\r\n </ul>\r\n </div>\r\n <div id=\"idx_cnt1\">\r\n <div id=\"left\">\r\n <div class=\"top spacer\">\r\n </div>\r\n <div class=\"main\">\r\n <div class=\"tit\">\r\n <h2>\r\n <span>热点信息</span></h2>\r\n </div>\r\n <ul class=\"hinfo-text\">\r\n <li><a href=\"http://jiancai.xyecom.com/news/channel-5.aspx\">[营销学院]</a> <a href=\"http://jiancai.xyecom.com/news/content-10.aspx\"><font style=color:#008000;font-weight:bold;font-style:italic;text-decoration:underline>test1323232</font></a></li><li><a href=\"http://jiancai.xyecom.com/news/channel-3.aspx\">[市场分析]</a> <a href=\"http://jiancai.xyecom.com/news/content-8.aspx\">测试测试测试</a></li>\r\n </ul>\r\n <ul class=\"hinfo-img\">\r\n <li><a href=\"#\">\r\n <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_6.jpg\" width=\"118\"\r\n height=\"42\" alt=\"\" /><span>沈阳市金山技术有限公司</span></a></li>\r\n   <li><a href=\"#\" class=\"orange\">\r\n <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_pic_7.jpg\" width=\"118\"\r\n height=\"42\" alt=\"\" /><span>华北造纸生产基地</span></a></li>\r\n </ul>\r\n <div class=\"clr\">\r\n </div>\r\n </div>\r\n <div class=\"btm spacer\">\r\n </div>\r\n </div>\r\n <div id=\"mid\">\r\n <a href=\"\">\r\n <img src=\"http://jiancai.xyecom.com/templates/default/images/temp_bnr_2.jpg\" width=\"360\"\r\n height=\"194\" alt=\"\" /></a>\r\n </div>\r\n <div id=\"right\">\r\n\t\r\n\t<div class=\"B_8 r\" style=\"display:none;\" id=\"xy_login_nologin\">\r\n\t\t<div class=\"B_8\">\r\n\t\t\t<div class=\"B_9\">立即登录</div>\r\n\t\t\t<div class=\"B_10\"><a class=\"white\" href=\"http://jiancai.xyecom.com/user\">进入商务管理后台</a></div>\r\n\t\t</div>\r\n\t\t<div class=\"B_11_2 clr\">\r\n\t\t\t<div class=\"B_12\">\r\n\t\t\t\t<div class=\"B_12\">\r\n\t\t\t\t\t<div class=\"B_13\">用户名：</div>\r\n\t\t\t\t\t<div class=\"B_15\"><input type=\"text\" tabindex=\"1\" class=\"tf1\" name=\"_lbox_username\" id=\"_lbox_username\" onkeydown =\"_xy_KeyPress('_btnBoxLogin');\"/></div>\r\n\t\t\t\t</div>\r\n\t\t\t\t<div class=\"B_12\">\r\n\t\t\t\t\t<div class=\"B_13\">密码：</div>\r\n\t\t\t\t\t<div class=\"B_15\"><input type=\"password\" tabindex=\"2\" class=\"tf1\" name=\"_lbox_password\" id=\"_lbox_password\" onkeydown =\"_xy_KeyPress('_btnBoxLogin');\"/></div>\r\n\t\t\t\t</div>\r\n\t\t\t\t<div class=\"B_16 clr\" style=\"padding-top:5px;\">\r\n\t\t\t\t <input id=\"_btnBoxLogin\" height=\"29\" width=\"108\" type=\"image\" src=\"http://jiancai.xyecom.com/templates/default/images/dabn6.gif\" onclick=\"return xy_BoxLogin();\"/> \r\n\t\t\t\t <a href=\"http://jiancai.xyecom.com/getpassword.aspx\">忘记密码？</a>\r\n\t\t\t\t</div>\r\n\t\t\t</div>\r\n\t\t\t<div class=\"login_links\">\r\n\t\t\t\t<ul class=\"service\">\r\n\t\t\t\t\t<li class=\"s_1\"><a href=\"http://jiancai.xyecom.com/user/\"><strong>发布信息</strong></a></li>\r\n\t\t\t\t\t<li class=\"s_2\"><a href=\"http://jiancai.xyecom.com/register.aspx\"><strong>注册会员</strong></a></li>\r\n\t\t\t\t</ul>\r\n\t\t\t\t<div class=\"clr\"></div>\r\n\t\t\t</div>\r\n\t\t</div>\r\n\t</div>\r\n \r\n\t<div class=\"B_8 r\" id=\"xy_login_logined\">\r\n\t\t<div class=\"B_8\">\r\n\t\t\t<div class=\"B_9\">欢迎登录</div>\r\n\t\t\t<div class=\"B_10\"><a class=\"white\" href=\"\" id=\"_lbox_ucenter\">进入商务管理后台</a></div>\r\n\t\t</div>\r\n\t\t<div class=\"B_11 clr\">\r\n\t\t\t<div class=\"E_1\"><font class=\"huei14\">欢迎您！</font> <span id=\"_lbox_uname\"></span> [<a target=\"_self\" class=\"hui12i\" href=\"http://jiancai.xyecom.com/logout.aspx\">退出</a>]</div>\r\n\t\t\t<div class=\"B_12 clr\">\r\n\t\t\t\t<div class=\"E_6\"><a href=\"http://jiancai.xyecom.com/user/infoselect.aspx\">发布产品</a> | <a href=\"http://jiancai.xyecom.com/user/addnews.aspx\">发布资讯</a> | <a href=\"http://jiancai.xyecom.com/user/receivemessagelist.aspx\">我的留言</a></div>\r\n\t\t\t\t<div style=\"padding-top:20px;padding-left: 37px;\" class=\"E_6 mt10\"><a href=\"/user/\"";
foreach(Match m in Regex.Matches(str,@"(?i)<a[^>]*href=([""'])?(http://jiancai.xyecom.com)?/[^""']+\.(aspx|html)\1[^>]*>[^<>]*</a>"))
{
   Console.WriteLine(m.Value);
}

/*
<a href="/search/advanced_search.aspx" class="black">[高级搜索]</a>
<a href="http://jiancai.xyecom.com/contributor.aspx" class="black">[投稿]</a>
<a href="http://jiancai.xyecom.com/post.aspx" class="black">[发布信息]</a>
<a href="http://jiancai.xyecom.com/baike/index.aspx" class="black">[百科]</a>
<a target="_blank" href="/search/seller_search-offer--花花-------.aspx">花花</a>
<a target="_blank" href="/search/seller_search-offer--方法-------.aspx">方法</a>
<a target="_blank" href="/search/seller_search-offer--huahua-------.aspx">huahua</a>
<a target="_blank" href="/search/seller_search-offer--ggf-------.aspx">ggf</a>
<a target="_blank" href="/search/seller_search-offer--ggf,r6-------.aspx">ggf,r6</a>
<a href="http://jiancai.xyecom.com/news/channel-5.aspx">[营销学院]</a>
<a href="http://jiancai.xyecom.com/news/channel-3.aspx">[市场分析]</a>
<a href="http://jiancai.xyecom.com/news/content-8.aspx">测试测试测试</a>
<a href="http://jiancai.xyecom.com/getpassword.aspx">忘记密码？</a>
<a target="_self" class="hui12i" href="http://jiancai.xyecom.com/logout.aspx">退出</a>
<a href="http://jiancai.xyecom.com/user/infoselect.aspx">发布产品</a>
<a href="http://jiancai.xyecom.com/user/addnews.aspx">发布资讯</a>
<a href="http://jiancai.xyecom.com/user/receivemessagelist.aspx">我的留言</a> */
}
下次提问前先想清楚问题
一次性把问题描述清楚