$re = '/^[\p{L}]+(?:\s[\p{L}]+)*$/m';
$str = 'GEÇERLİ
ÖMER
ENES SEFA
ENES SEFA KÜCCÜK
ŞEYDA
İÇçiöşŞğĞ
GEÇERSİZ
1enes se
.dsds
enes dsdsd
öçds12
dd2sds';
preg_match_all($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