Check if string contains special characters in Swift

Question

I have to detect whether a string contains any special characters. How can I check it? Does Swift support regular expressions?

var characterSet:NSCharacterSet         


        

Answer 1

Two Solutions:

1)

extension String {
    var stripped: String {
        let okayChars = Set("abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ")
        return self.filter {okayChars.contains($0) }
    }
}

2)

class TrimDictionary {

    static func trimmedWord(wordString: String) -> String {
        var selectedString = wordString
    
        let strFirst = selectedString.first
        let strLast = selectedString.last
    
        let characterset = CharacterSet(charactersIn: "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
        if strFirst?.description.rangeOfCharacter(from: characterset.inverted) != nil {
            selectedString = String(selectedString.dropFirst())
        }
        if strLast?.description.rangeOfCharacter(from: characterset.inverted) != nil {
            selectedString = String(selectedString.dropLast())
        }
        return selectedString
    }
}