Collect email php code

Since I made a program for sending mass emails, of course it couldn’t be done without an email address, so I wrote a program to collect email addresses.
Reprinted from: http://www.tongqiong.com/read.php?tid-35-ds-1.html

//Author: www.tongqiong.com
$url='http://www.tongqiong.com/read.php?tid-1-ds-1.html'; // This page definitely contains an email address.
$content=file_get_contents($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));

//Author: www.tongqiong.com
 ?>