如何从提取的网页内容中筛选出超链
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><!--[30,59,1] published at 2009-07-10 21:30:13 from #150 by system--><html xmlns="https://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><title>新浪首页</title><meta name="description" content="新浪网为全球用户24小时提供全面及时的中文资讯，内容覆盖国内外突发新闻事件、体坛赛事、娱乐时尚、产业资讯、实用信息等，设有新闻、体育、娱乐、财经、科技、房产、汽车等30多个内容频道，同时开设博客、视频、论坛等自由互动交流空间。"><meta name="stencil" content="6HtwmypggdgP1NLw7NOuQBI2TW8+CfkYCoyeB8IDbn8=" /><script type="text/javascript" src="https://i3.sinaimg.cn/home/sinaflash.js"></script><script language="javascript" type="text/javascript" src="https://d2.sina.com.cn/d1images/button/rotator.js"></script><style type="text/css">/* 全局样式 */body,ul,ol,li,p,h1,h2,h3,h4,h5,h6,form,fieldset,table,td,img,div{margin:0;padding:0;border:0;}body{background:#fff;color:#333;font-size:12px; margin-top:5px;font-family:"宋体";}ul,ol{list-style-type:none;}select,input,img,select{vertical-align:middle;}a{text-decoration:underline;}a:link{color:#009;}a:visited{color:#800080;}a:hover,a:active,a:focus{color:#c00;}.clearit{clear:both;}/* page */#page{width:950px; overflow: visible; _display:inline-block; margin:0 auto;}/* 顶部 top */.top{height:27px; position:relative; z-index:99; padding:1px; border:1px #fdd26c solid; border-bottom:1px #e1a841 solid; color:#000; background:url(https://i1.sinaimg.cn/home/deco/2008/0329/sinahome_0803_ws_001.gif) repeat-x 0 0 #fff;}.top a,.top a:visited{color:#000; text-decoration:none;}.top a:hover,.top a:active{color:#000; text-decoration:underline;}.topBlk{height:27px; overflow:hidden; _display:inline-block; background:url(https://i1.sinaimg.cn/home/deco/2008/0329/sinahome_0803_ws_001.gif) repeat-x 0 -50px <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Trans
