php结合正则批量抓取网页中邮箱地址

<?php
$url='http://www.3lian.net'; //要采集的网址
$content=file_get_contents($url);
//echo $content;
function getEmail($str) {
//$pattern = "/([a-z0-9]*[-_.]?[a-z0-9]+)*@([a-z0-9]*[-_]?[a-z0-9]+)+[.][a-z]{2,3}([.][a-z]{2})?/i";
$pattern = "/([a-z0-9-_.]+@[a-z0-9]+.[a-z0-9-_.]+)/";
preg_match_all($pattern,$str,$emailArr);
 
return $emailArr[0];
}
print_r( getEmail($content));
?>

<?php
$url='http://www.j3lian.net'; //当页已留邮箱
$content=file_get_contents($url); //获取页面内容
function getEmail($str) { //匹配邮箱内容
$pattern = "/([a-z0-9-_.]+@[a-z0-9]+.[a-z0-9-_.]+)/";
preg_match_all($pattern,$str,$emailArr);
return $emailArr[0];
}
print_r( getEmail($content));
?>