$re = '/^(?=[\p{L}0-9]+-[\p{L}0-9]+)([^.]+\.(?:org|com).*)/m';
$str = 'some-thing.org
some-thing.org.sg
some-thing.com
some-thing.com.sg
some-thing.com.*
some1-thing.com
sòme1-thing.org
some-thing
some-thing.moc';
preg_match_all($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