$re = '/\* \d+ FETCH \(UID \d+ BODY\[] {\d+}\s*([\s\S]*?)(?=\)[\r\n]+(?:\* \d+ FETCH \(UID \d+ BODY\[] {\d+}|SS01 OK Success))/m';
$str = '* 1 FETCH (UID 2 BODY[] {7765}
data to be extracted
from here!
)
* 2 FETCH (UID 3 BODY[] {443}
data to be extracted
from here!
)
* 3 FETCH (UID 4 BODY[] {4432}
data to be extracted
from here!
)
* 4 FETCH (UID 5 BODY[] {123}
data to be extracted
from here!
)
SS01 OK Success';
preg_match_all($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