does DIRECTORY_SEPARATOR need to be escaped in regex?

[github-actions]

https://api.github.com/battis/data-utilities/blob/a5d7dd650f609523c713628191dafd5e2bef1400/src/PHPUnit/FixturePath.php#L7

use ReflectionClass;

// TODO does DIRECTORY_SEPARATOR need to be escaped in regex?
trait FixturePath
{
    private ?string $_fixturePath = null;