$re = '/(?<Name>\b\S*?):\s(?<Value>.*?)\s*(?=(?:\b\S*?:\s)|$)/m';
$str = 'REKVISITION_NR: 1234567 Dato: 23-07-2018 Rekvirent: ABC, DEF GHI, JKL 60, 8600 MNO Sted: JKL 60, 8600 MNO, Kl.:14:00:00, Bestilt_tid: 60 min Tolkensnavn: PQR STU Koert_fra: VXY , 8600 Silkeborg Vedr.: Z CPR: 123456-7890 Sprog: Arabisk Type: Personlig fremmøde Godkendt: 24-07-2018';
preg_match_all($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