This is one of those cases where you should consider AnkiDroid a companion app to Anki Desktop
sync up to AnkiWeb, down to Anki Desktop, export to csv, batch edit using powerful tools, import the notes again to update them, sync up to Web down to Droid, done
That's how I'd do a job like this anyway
Only other way would be to go into the sqlite database directly and execute a semi-complicated query, the database structure is on the AnkiDroid Wiki in github but that will be far from supported - it can work but you'll need to make it work yourself if you do it
Take a good backup either way :-), good luck -
-Mike
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