swift 3 - search result also with diacritics

Question

In my application I use a search that works well but I need advice. I do not know how to do that when I search for text without diacritics that the result also with diacriti

Answer 1

This is Martin R's solution, just easier to consume.

Copy this into a Swift file:

extension String {
    func contains(insensitive other: String, range: Range<String.Index>? = nil, locale: Locale? = nil) -> Bool {
        return self.range(of: other, options: [.diacriticInsensitive, .caseInsensitive], range: range, locale: locale) != nil
    }
}

Use it like this:

if "Música".contains(insensitive: "music") {
    print("hurray!")
}

Answer 2

You can use range(of:, options:) with options for a diacritic insensitive (and optionally case insensitive) search. Example:

let list = ["holesovice", "holešovice"]
let searchTerm = "sovi"

let filtered = list.filter {
    $0.range(of: searchTerm, options: [.diacriticInsensitive, .caseInsensitive]) != nil
}

print(filtered) // ["holesovice", "holešovice"]