PHP code to capture email addresses in web pages

/**
 desc: code to collect the mailbox in the web page
 link: bbs.it-home.org
 date: 2013/2/24
*/
$url='http://bbs.it-home.org'; //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));
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