Matching on accented letters

I am looking for a way to match letters and their accented equivalents in a SPARQL query.  For example, a search for names beginning with the letter O would return names such as Osbourne, Owen, but also Ömen.  I have found lots of resources around normalising accented characters, but essentially we are trying to go the other way, by taking a non-accented character and matching it against itself and all its possible accented equivalents.


Has anyone done this before and if so how?


Thanks

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