How can I check to see if a string contains characters of whitespace/alphanumeric/etc?

Question

How can you use the \"ctype.h\" library in Swift to be able to use isAlpha or isSpace on characters? Or is there a better, Swift, way of doing it?

Answer 1

Shorter extension (swift 4.1)

extension String {
    var containsWhitespace : Bool {
        return(self.rangeOfCharacter(from: .whitespacesAndNewlines) != nil)
    }
}

You can change the .whitespacesAndNewlines with any other CharacterSet like this:

extension String {
    var containsDigits : Bool {
        return(self.rangeOfCharacter(from: CharacterSet.decimalDigits) != nil)
    }
}