That would be incorrect, as Unicode defines the two forms to be interchangeable. You'd do a decomposition before doing a search anyway in which case both forms

That would be incorrect, as Unicode defines the two forms to be interchangeable. You'd do a decomposition before doing a search anyway in which case both forms become the same code points (which ones depends on the decomposition type). The correct way to handle this is by tagging the text with a language tag, as has been mentioned in other replies to the parent post.