componentsSeparatedByCharactersInSet and join - Remove specific characters in a string

In this example, parenthesis "()" and white space " " are removed. For Xcode 6.4 (Swift 1.2):

let phoneOld = "(03)123 456 789" as NSString

let charSet = NSCharacterSet(charactersInString: "() ")

//Separate phoneOld by unwanted characters in charSet and form an array.

let phoneArray = phoneOld.componentsSeparatedByCharactersInSet(charSet) as! [String]

//Join all elements of phoneArray together without inserting any character between the elements.

let phoneNew = join("", phoneArray)

Results:

For Swift 2:

let phoneOld = "(03)123 456 789" as NSString

let charSet = NSCharacterSet(charactersInString: "() ")

let phoneArray = phoneOld.componentsSeparatedByCharactersInSet(charSet)

let phoneNew = phoneArray.joinWithSeparator("")

Related string function:

stringByReplacingOccurrencesOfString - Replace characters within a string by other characters