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Hi @Peter, yes that's what I meant. Thanks, works nicely!

Peter, not sure you understood me.

Archive and Search results are working fine. But the same settings are not working for the Categories.
https://share.getcloudapp.com/v1uP5nYE

It says "Page not found"

Peter,

I understand the $GET['field_id1'] gets me the value of field1.
My question is which variable to use in the function to apply the fieldname for which the remote validation is set up.
In my case I have various fields that need to be checked for "forbidden-words" (and they are not called "field1")
https://share.getcloudapp.com/JruyWOQB

Apologies if I'm not using the proper vocabulary, but I expect you to try to understand a no-hardcore developer.

Looking forward to your help.

Peter, I'm struggling with the connection between validation rule set for the field and the action in functions.php, and back to the custom error message.

The documentation mentions

add_action( 'wp_ajax_my_action1', function () {
    // Get the field value via the global variable $_GET
    if ( $_GET['field_id1'] === 'something' ) {
        echo 'true'; // Valid
    } else {
        echo 'false'; // Invalid
        // or
        // echo 'This value is invalid, please try again.'; // Custom error message
    }
    die;
} );

How to replace the $GET['field_id1'], as the action is to be performed on the current field the validation is defined for.
According to he reference you gave for the regex documentation (thanks for that!) the action should contain something like
'$pattern = "/....|....|..../";
echo preg_match($pattern, 'current field');'

So to my understanding the if-else statement needs to be replaced by the echo statement, right? Then how to connect to the current field?

Hi Peter, thanks a lot, that was helpful.

I managed to get it to my liking.

Hi Long,

The code I gave you before is for listing all video's. That works through view type = shortcode.
In another view the details of a video is shown (view type = singular), there the code works nicely.

Back to your question, here is the code for the checkbox list field.

<?php
add_filter( 'rwmb_meta_boxes', 'your_prefix_function_name' );

function your_prefix_function_name( $meta_boxes ) {
    $prefix = '';

    $meta_boxes[] = [
        'title'      => __( 'VideoDetails', 'your-text-domain' ),
        'id'         => 'videodetails',
        'post_types' => ['video'],
        'fields'     => [
            [
                'name' => __( 'Keywords', 'your-text-domain' ),
                'id'   => $prefix . 'keywords',
                'type' => 'text',
            ],
            [
                'name' => __( 'Length', 'your-text-domain' ),
                'id'   => $prefix . 'length',
                'type' => 'text',
            ],
            [
                'name' => __( 'Trailer', 'your-text-domain' ),
                'id'   => $prefix . 'trailer',
                'type' => 'url',
            ],
            [
                'name'            => __( 'Platform', 'your-text-domain' ),
                'id'              => $prefix . 'platform',
                'type'            => 'checkbox_list',
                'options'         => [
                    'F'  => __( 'Fansly', 'your-text-domain' ),
                    'LF' => __( 'LoyalFans', 'your-text-domain' ),
                    'OF' => __( 'OnlyFans', 'your-text-domain' ),
                ],
                'std'             => true,
                'inline'          => true,
                'select_all_none' => true,
            ],
        ],
    ];

    return $meta_boxes;
}