$re = '/(?s:.*\n)\K(?:G70|F70|G71|F71).*(\d{5}).*(?:IMPORTO|Prelievo).*(?=(?:G70|G71|F70|F71)\s\d{4}\s\d{5}\s\d{2}\/\d{2}\/\d{4}\s11:11)/s';
$str = 'G70 1234 00012
....
....
....
....
IMPORTO
....
....
F70 1234 00013
....
....
Prelievo
....
....
F70 1234 00014 10/10/2019 11:11
....';
preg_match_all($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