[insert_php]

global $wpdb;

// group name key
$meta_key = ‘_create_new_group’;

// user input
$search = $_REQUEST[‘q’].’%’;

$sql = “SELECT meta_value
FROM {$wpdb->postmeta}
WHERE meta_key = ‘{$meta_key}’
AND meta_value LIKE %s”;
$sql = $wpdb->prepare($sql,$search);
// var_dump($sql);
$groupnames = $wpdb->get_col($sql);

[/insert_php]