$re = '/[^\n\d{6,}](?:(?:[a-z\s.]+(\n[a-z\s.])*)|.+)/mi';
$str = 'xxx
27223525
West Food Group B.V.
52608670
Westcon
Group European Operations Netherlands Branch
30221053
Westland Infra Netbeheer B.V.
27176688
Wetransfer B.V.
34380998
WETRAVEL B.V.
70669783';
preg_match_all($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