// My evil
extension Range {
    var NSRangeValue : NSRange {
        let location = reflect(startIndex).summary.toInt() ?? 0
        let length = reflect(distance(startIndex, endIndex)).summary.toInt() ?? 0
        return NSMakeRange(location, length)
    }
}

let testString = "abcdefghij"
var range = testString.rangeOfString("cde", options: .CaseInsensitiveSearch, range: nil, locale: nil)!
(testString as NSString).substringWithRange(range.NSRangeValue)