db settings in wp-config not updated

On creating a clone on another site, the last step offers to update the wp-config.php file of the clone site. However this feature does not (always) work.

Looking at file xcloner_restore.php, class Xloner_Restore, method update_wp_config(), I see the following regular expressions:
"/(?<=DB_NAME', ')(.*?)(?='\);)/"
This fails if that line is written as:
define( 'DB_NAME', 'wpdb' );
which in WP is the coding standard. By changing the regular expressions to accept a space, I got it to work:
"/(?<=DB_NAME', ')(.*?)(?=' \);)/"
But you might want it make more accepting, something like:
"/(?<='DB_NAME', '|'DB_NAME',')(.*?)(?=' *\);)/"
That is, making the spaces optional.

Full code changes:

        $content = preg_replace("/(?<='DB_NAME','|'DB_NAME', ')(.*?)(?=' *\);)/", $remote_mysql_db, $content);
        $content = preg_replace("/(?<='DB_USER','|'DB_USER', ')(.*?)(?=' *\);)/", $remote_mysql_user, $content);
        $content = preg_replace("/(?<='DB_PASSWORD','|'DB_PASSWORD', ')(.*?)(?=' *\);)/", $remote_mysql_pass, $content);
        $content = preg_replace("/(?<='DB_HOST','|'DB_HOST', ')(.*?)(?=' *\);)/", $remote_mysql_host, $content);