$re = '/[^\d](;)\n/';
$str = '15;WB;250;2013-12-16;275;2013-12-16;18573; 16,00;
JAN KOWALSKI;WARSZAWA 1/9 m.5;
16;WB;3;2014-01-03;305;2014-01-03; 20,00;
JAN KOWALSKI;WARSZAWA;
17;WB;9;2014-01-10;382;2014-01-10; 30,00;
JAN KOWALSKI;WARSZAWA, Ulica JELEÑSKA 21 m.10;';
preg_match_all($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