$content="欢迎大家光临<a href=www.sina.com.cn>新浪网</a>";
$quchu='^<a .*?>(.*?)新浪网(.*)<\/a>^is';
$content=preg_replace($quchu,"",$content);
echo $content;总是不成功,我想去掉链接中带有新浪网的超链接。请大家帮个忙吧,谢谢!