$re = '/(?:UTF-8&q=+(.*)$|\?P=+(.*)$|\/search\/node\/+(.*)$)/m';
$str = '/search/results/?cx=015839161432768919274:z2n1gijj14s&cof=FORID:9&ie=UTF-8&q=conserative+
/search/results/?cx=015839161432768919274:z2n1gijj14s&cof=FORID:9&ie=UTF-8&q=congress+numbers
/search/results/?cx=015839161432768919274:z2n1gijj14s&cof=FORID:9&ie=UTF-8&q=chemistry+degree
/search/?P=MBA 742
/search/node/adim account
';
preg_match_all($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