$re = '/\R(?=message)/';
$str = 'message Acc {
message AccErr {
enum Enum {
UNKNOWN = 0;
CASH = 1;
}
}
string account_id = 1;
string name = 3;
string account_type = 4;
}
message Name {
string firstname = 1;
string lastname = 2;
}
';
preg_match_all($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