How can I strip a single tag from an email post

The following regex should do the trick to select all instances of the videopack shortcode, including contents: \[videopack.*?\[\/videopack\]

$post_description = preg_replace( '\[videopack.*?\[\/videopack\]', '', $post->post_content );

• https://www.php.net/manual/en/function.preg-replace.php
• https://regexr.com/