NSPredicate that ignores whitespaces

Question

I need to use NSPredicate to match two strings, case-insensitive, diacritic insensitive, and whitespace-insensitive.

The predicate would look something

Answer 1

Swift 4:

func ignoreWhiteSpacesPredicate(id: String) -> NSPredicate {
    return NSPredicate(block: { (evel, binding) -> Bool in
        guard let str = evel as? String else {return false}
        let strippedString = str.components(separatedBy: CharacterSet.whitespaces).joined(separator: "")
        let strippedKey = id.components(separatedBy: CharacterSet.whitespaces).joined(separator: "")
        return strippedString.caseInsensitiveCompare(strippedKey) == ComparisonResult.orderedSame
    })
}

Example:

let testArray:NSArray =  ["abc", "a bc", "A B C", "AB", "a B d", "A     bC"]
let filteredArray = testArray.filtered(using: ignoreWhiteSpacesPredicate(id: "a B C")) 

Result:

["abc", "a bc", "A B C", "A bC"]