$re = '/^(?=[A-Z][a-z]*$)(?i)(?!.*[aeiouy]{3}|.*[^aeiouy\n]{3})[a-z]+$/m';
$str = 'Aakemenkyu
Aaakemenkyu
Klepathass
Waknampite
Wwwaknampite
Flaetobsak
Oladkinqyt
Mmalinnetj
MmalinnetjJ
Ijythlzuoe
Tervkpxyib
Ifuemkoeui
Mqjtobojex
Ephyrjiuau';
preg_match_all($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