How to create String split extension with regex in Swift?

Question

I wrote extension that create split method:

extension String {
    func split(splitter: String) -> Array {
        return self.         


        

Answer 1

First, your split function has some redundancy. It is enough to return

return self.componentsSeparatedByString(splitter)

Second, to work with a regular expression you just have to create a NSRegularExpression and then perhaps replace all occurrences with your own "stop string" and finally separate using that. E.g.

let regEx = NSRegularExpression.regularExpressionWithPattern
  (splitter, options: NSRegularExpressionOptions(), error: nil)
let stop = "SomeStringThatYouDoNotExpectToOccurInSelf"
let modifiedString = regEx.stringByReplacingMatchesInString
     (self, options: NSMatchingOptions(), 
              range: NSMakeRange(0, countElements(self)), 
       withTemplate:stop)
return modifiedString.componentsSeparatedByString(stop)