$re = '/(?:\G(?!^)|ряд:)[\s,]\K\d+/';
$str = 'Число 560
Размерный ряд: 42 88,44,46
#Цена: 400 руб 400коп. шт.
Место: 2А-75 корпус А';
preg_match_all($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