$re = '/^([0-9]+\sx) [-\w\s®.,]*? [0-9]{3}-\d[A-Z]\d+(-AB)?/m';
$str = '1 x Product® 100, Low range items
3,456.00 USD
Cat. No. 012-3A45
1 x Product® 100. Low range items - LRI
123,456.00 USD
Part. no. 201-5G95
2 x Product Mid Range Items
7,654.00 USD
Art. no. 001-8Q147-AB';
preg_match_all($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