Elixir support the Unicode flag in Regex
You can simply use
String.normalize("NäytẗkuvaèüÀÁÂÃĀĂȦÄẢÅǍȀȂĄẠḀẦẤàáâä", :nfd) |> String.replace(~r/\W/u, "")
"NayttkuvaeuAAAAAAAAAAAAAAAAAAaaaa"
this one will strip white spaces and special characters diacritical marks (accents and such) but keep numbers
