$re = '/^(?:[^<>()[\].,;:\s@"]+(\.[^<>()[\].,;:\s@"]+)*|"[^\n"]+")@(?:[^<>()[\].,;:\s@"]+\.)+[^<>()[\]\.,;:\s@"]{2,63}$/im';
$str = 'abcde.fghi@gmail.com
nombre-apellido@do-mi-nio.info
germán@bla.com
yo@mi-compañía.com
estação@brasil.com.br
no@esunmail
**@as
juan@{{192.168.1.52}}
*****@mail.xx
#($^%#$@^(#$^.com';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php