Function inside a validation rule

Hi,
This type of custom validation rule used to work in CI3 but I am getting an error with CI4.
Code:

PHP Code:

$validation->setRrules([
    'room' => [
        'label'    => 'Room',
        'rules'    => [
            'required',
            [
                'validateRoom',
                function ($str) use (&$room_list) {
                    return (in_array($str, $room_list));
                 }
            ]
        ]
    ]
]); 


I am getting the following

preg_match(): Argument #2 ($subject) must be of type string, array given

SYSTEMPATH/Validation/Validation.php at line 292

Code:

292             if (! $isCallable && preg_match('/(.*?)\[(.*)\]/', $rule, $match)) {
293                 $rule  = $match[1];
294                 $param = $match[2];
295             }

It seems the second rule that includes a function, which is in an array, is causing this error.
Is it that this cannot be done in CI4 at all or am I just missing something?

Thanks,

The closure validation rule will be added in v4.3.0.

See https://github.com/codeigniter4/CodeIgniter4/pull/6951

ci-phpunit-test | CodeIgniter Testing Guide | CodeIgniter 3 to 4 Upgrade Helper

The closure validation rule will be added in v4.3.0.

See https://github.com/codeigniter4/CodeIgniter4/pull/6951

Great. Good to know. Thanks.

The use keyword has two purposes: it tells a class to inherit a trait and it gives an alias to a namespace.

What did you Try? What did you Get? What did you Expect?

Joined CodeIgniter Community 2009.  ( Skype: insitfx )

The closure validation rule will be added in v4.3.0.

See https://github.com/codeigniter4/CodeIgniter4/pull/6951

When will version 4.3 be available?