[RSS Feed/News] Is a part text replacement possible in custom BB code simple replacement?

[XenForo]

Basically I want a custom BB code to turn a youtube URL into an image of the thumbnail

PHP:

convert:
[youtubethumb]https://www.youtube.com/watch?v=XXX[/youtubethumb]

into:
[image]https://i.ytimg.com/vi/XXX/maxresdefault.jpg[/image]

Is this possible with custom BB code with a simple replacement or do I need to use a PHP callback?

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