How can I carry out an automatic search of all pages/posts on my site for any content embedded using oEmbed (preferably Facebook/Instagram content)?
The reason I ask is because this WPBeginner post says that on October 24th, all Facebook or Instagram content embedded on a site using oEmbed will be deprecated, and such content will be (slightly) broken. I'd like to first determine how much oEmbed content I have on my site. My site is has a relatively large amount of pages/posts (content added by others), so manually searching each will be a bit tedious.
Would I perhaps need to carry out a database search? Or a text search through all the files?
FYI my site uses Classic Editor throughought--not Gutenberg.