Filter non-digits from string

Question

Using only swift code I cant figure out how to take \"(555) 555-5555\" and return only the numeric values and get \"5555555555\". I need to remove all the parentheses, whit

Answer 1

You'll want to use NSCharacterSet:

Check out this NSHipster link for Swift and Obj-C implementations: http://nshipster.com/nscharacterset/

Similar example:

var string = "  Lorem    ipsum dolar   sit  amet. "

let components = string.componentsSeparatedByCharactersInSet(NSCharacterSet.whitespaceCharacterSet()).filter({!isEmpty($0)})

string = join(" ", components)

See: punctuationCharacterSet

Description:

Returns a character set containing the characters in the category of Punctuation. Informally, this set is the set of all non-whitespace characters used to separate linguistic units in scripts, such as periods, dashes, parentheses, and so on.

@Tapani Makes a great suggestion: NSCharacterSet.decimalDigitCharacterSet().invertedSet