ben@localhost ~ $ php
<?php
$str="define service { some crap = blah\n lala = blal\n}";
preg_match("/(define service\s+\{.*?\})/si", $str, $match);
var_dump($match);
?>
array(2) {
  [0]=>
  string(48) "define service { some crap = blah
 lala = blal
}"
  [1]=>
  string(48) "define service { some crap = blah
 lala = blal
}"
}