If you use native editor (and not some PageBuilder that stores data in its way), then you should be able to use the_content
filter to do that:
add_filter( 'the_content', 'my_the_content_filter' );
function my_the_content_filter( $content ) {
$content = str_replace(...);
return $content;
}
You might put some conditions in there, to check if you modify only pages or only on single page and so on…
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