PHP和正则表达式

<a href="http://www.pcvz.com/Program/WEB/PHP/PHPbds/Program_62304.html">http://www.pcvz.com/Program/WEB/PHP/PHPbds/Program_62304.html</a>

<a href="http://jimmys.cn/2008/01/03/php%E6%AD%A3%E5%88%99%E8%A1%A8%E8%BE%BE%E5%BC%8F%E7%9A%84%E5%BF%AB%E9%80%9F%E5%AD%A6%E4%B9%A0%E6%96%B9%E6%B3%95/">http://jimmys.cn/2008/01/03/php%E6%AD%A3%E5%88%99%E8%A1%A8%E8%BE%BE%E5%BC%8F%E7%9A%84%E5%BF%AB%E9%80%9F%E5%AD%A6%E4%B9%A0%E6%96%B9%E6%B3%95/</a>