$re = '/^(\S+)\h([A-Z]+)\h([^|]+)/s';
$str = '2021-12-08T18:18:38+00:00 INFO Produktbestand erfolgreich von Collmex abgerufen | "STOCK_AVAILABLE;23;1;363;PCE;-1\\r\\nMESSAGE;S;204020;Daten?bertragung erfolgreich. Es wurden 1 Datens?tze verarbeitet.\\r\\n"
';
preg_match_all($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