Just use the localizedStandardContains(_:) function in your predicate.
let predicate = #Predicate<Band> { $0.name.localizedStandardContains(userInput) }
This is the most appropriate method for doing user-level string searches, similar to how searches are done generally in the system. The search is locale-aware, case and diacritic insensitive. The exact list of search options applied may change over time.
https://developer.apple.com/documentation/swift/stringprotocol/localizedstandardcontains(_:)
piaume
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