Remove hyperlink from name field

add_filter('preprocess_comment', 'remove_links_from_comment_author');

function remove_links_from_comment_author($commentdata) {

    // Regular expression to detect hyperlinks

    $pattern = '/<a href\s*=\s*"[^"]+">([^<]+)<\/a>/i';

    // Check if the comment author's name contains a hyperlink

    if (preg_match($pattern, $commentdata['comment_author'])) {

        // Remove the hyperlink

        $commentdata['comment_author'] = preg_replace($pattern, '$1', $commentdata['comment_author']);

        // Or you can choose to block the comment by doing something like:

        // wp_die('Hyperlinks are not allowed in the name field.');

    }

    return $commentdata;

}