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I've verified that adding the unicode letter designator \p{L} to the user name component allows internationalized user names: ``/^[\p{L}a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[\p{L}a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?$/iu``