<a href="http://www.renren.renren.com/460001/">访问</a>
<a href="http://www.renren.renren.com/2248/">访问</a>
<a href="http://www.renren.renren.com/369746/">访问</a>获取
http://www.renren.renren.com/460001
http://www.renren.renren.com/2248
http://www.renren.renren.com/369746求写法
<a href="http://www.renren.renren.com/2248/">访问</a>
<a href="http://www.renren.renren.com/369746/">访问</a>获取
http://www.renren.renren.com/460001
http://www.renren.renren.com/2248
http://www.renren.renren.com/369746求写法
+ "<a href=\"http://www.renren.renren.com/2248/\">访问 </a> \n"
+"<a href=\"http://www.renren.renren.com/369746/\">访问 </a>";
String regex = "(?i)(?<=href=\")[^\"]+(?=\")";
Matcher m=Pattern.compile(regex).matcher(str);
while(m.find())
{
System.out.println(m.group());
}