php匹配字符中链接地址程序代码

$str="ssdsfsdfsdfss";
if(preg_match("/]*>|/[^a]*a[^>]*>/i",$str))
{
echo "该字符串有超链接";
}
else
{
echo "该字符串没有超链接标记";
}
?>

echo preg_replace("/(?]*)(?=>)/i","#", "你好，点这里看看你好，点这里看看");
?>

function match_links($document) {   

    preg_match_all("']+))[^>]*>?(.*?)'isx",$document,$links);                       

    while(list($key,$val) = each($links[2])) {

        if(!empty($val))

            $match['link'][] = $val;

    }

    while(list($key,$val) = each($links[3])) {

        if(!empty($val))

            $match['link'][] = $val;

    }       

    while(list($key,$val) = each($links[4])) {

        if(!empty($val))

            $match['content'][] = $val;

    }

    while(list($key,$val) = each($links[0])) {

        if(!empty($val))

            $match['all'][] = $val;

    }               

    return $match;

}