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<?php
$str = 'dfsafdhttp://www.sina.com/aa.phpdsgfdsgfds www.qq.com fdsfsd http://www.qq.com.cn/htmlgfdsf天于qq.com';
function test($text){
echo preg_replace('(http://|ftp://|www\.?|)(([\w-]+\.)+[\w-]+(/[\w-./?%&=]*)?){0,1}','',$text);
}
test($str);
?>
<?php
function test($text)
{
echo preg_replace('/(http:\/\/|ftp:\/\/|www\.?|)(([\w-]+\.)+[\w-]+(\/[\w-.\/?%&=]*)?){0,1}/','',$text);
}
test('dfsafdhttp://www.sina.com/aa.phpdsgfdsgfds www.qq.com fdsfsd http://www.qq.com.cn/htmlgfdsf天于qq.com');
?>