laravel 使用http purifier来过滤xss攻击，如何允许iframe来发布b站视频

环境：
//: <> (对待提问越认真，就越容易得到答复。)
//: <> (对待提问越认真，就越容易得到答复。)
//: <> (对待提问越认真，就越容易得到答复。)
//: <> (重要的事情说三遍！)

1. 运行环境

使用laravel8.0，php 7.4

2.测试代码

<?php

return [
    'encoding'      => 'UTF-8',
    'finalize'      => true,
    'cachePath'     => storage_path('app/purifier'),
    'cacheFileMode' => 0755,
    'settings'      => [
        'user_post_body' => [
            'HTML.Doctype'             => 'HTML 4.01 Transitional',
            'HTML.Allowed'             => 'div,b,strong,i,em,a[href|title],ul,ol,ol[start],li,p[style],br,span[style],img[width|height|alt|src],*[style|class],pre,hr,code,h2,h3,h4,h5,h6,blockquote,del,table,thead,tbody,tr,th,td',
            'CSS.AllowedProperties'    => 'font,font-size,font-weight,font-style,margin,width,height,font-family,text-decoration,padding-left,color,background-color,text-align',
            'AutoFormat.AutoParagraph' => true,
            'AutoFormat.RemoveEmpty'   => true,
        ],
        'bilibili' => [
            "HTML.SafeIframe"      => 'true',
            "URI.SafeIframeRegexp" => "%^https://player\.bilibili\.com/player\.html%"
        ],
    ],
];