td class=cate width="45%" 
  a class=M href="http://jmfengcai.cn.alibaba.com/athena/companydetail/jmfengcai.html" onMouseDown="return aliclick(this,'?alishop=companylistcompanyname');" target="_blank" class=M江门市蓬江区凤彩工艺厂/a 
br 
代码如上.我请问如何用正则表达式,把"http://jmfengcai.cn.alibaba.com/athena/companydetail/jmfengcai.html"提取出来? 
代码如下: