执行php artisan chemex:install时报错：

In TestDatabases.php line 159:

syntax error, unexpected ')'

出错源码片段：
protected function switchToDatabase($database)
{
DB::purge();

    $default = config('database.default');

    $url = config("database.connections.{$default}.url");

    if ($url) {
        config()->set(
            "database.connections.{$default}.url",
            preg_replace('/^(.*)(\/[\w-]*)(\??.*)$/', "$1/{$database}$3", $url),
        );
    } else {
        config()->set(
            "database.connections.{$default}.database",
            $database,
        );
    }
}