$re = '/(\d{4}.\d{3}.\d{3}) (\S+) (\S+) (\S+) (\S+) (\S+)\n(.+)\nHS\.code: (\S+) Country of origin: (\S+)\nEAN: (\S+)/m';
$str = '"11 4149.310.025 000 1 37,78 1 37,78
PISTON
HS.code: 87084099 Country of origin: EU/DE
EAN: 2050000141478
21 0734.401.251 000 4 3,05 1 12,20
PISTON RING
HS.code: 73182100 Country of origin: JP
EAN: 2050000026638"';
$subst = ": $1 $2 $3 $4 $5 $6 $7 $8 $9 $10\n";
$result = preg_replace($re, $subst, $str);
echo "The result of the substitution is ".$result;
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