$re = '/(?<=Compiled:\s).*?(?=\s*-)/m';
$str = '-- Compiled: Aug 6 2015 10:07:08 --
anotherline--
...';
preg_match_all($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