Remove WordPress Gutenberg block in content

remove_gutenberg_block.php

<?php

function remove_block_gutenberg( $content, $blockname ) {
	$blockname = str_replace('/', '\/',preg_quote($blockname));
	return preg_replace('/\<\!\-\- ' . $blockname . '[^)]+\/' . $blockname . ' \-\-\>/', '', $content);
}

// Based on this ticket https://wordpress.org/support/topic/strip-table-of-content-from-excerpt/
// There is a block that we don't want on excerpt automatically generated,
// Automatic excerpt cut the content and this can generate a broken content
// This happens because blocks can be everything from html, json or html comments and they are in the post_content

// If you want to know more about the wrong technicial decisions in Gutenberg 
// * https://daniele.tech/2020/05/gutenberg-drama-2020-edition-why-wordpress-is-against-the-wp-org-users/
// * https://daniele.tech/2019/05/your-wordpress-instance-is-leaking-data-also-with-gutenberg/

$content = remove_block_gutenberg(get_the_content(), 'wp:uagb/table-of-contents');