$re = '/(?![^\d]+)[^,]+/m';
$str = '\'Anakinra 100 g, gentechnologisch hergestellt aus E. coli.\'
\'Anakinra 100 mg, gentechnologisch hergestellt aus E. coli.\'
\'Anakinra 10.5 g, gentechnologisch hergestellt aus E. coli.\'
\'Anakinra 10, gentechnologisch hergestellt aus E. coli.\'
';
preg_match_all($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