Crash when parsing certain page

[fraserscottmorrison]

Hiya,

Ive encountered a crash which occurs when parsing this link http://go.acgedu.com/acg-parnellcollege/

Ive resolved it by putting a check that it can substring but this probably isn't addressing the root of the issue (maybe caused by the pages title being a url?)

    // Extract matches from string
    static func stringMatches(results: [NSTextCheckingResult], text: String, index: Int = 0) -> [String] {

        return results.map {
            let range = $0.rangeAtIndex(index)
            if text.characters.count > range.location + range.length {
                return (text as NSString).substringWithRange(range)
            }
            else {
                return ""
            }
        }
    }

[LeonardoCardoso]

Hi, @fraserscottmorrison! Thanks. Can you do a PR?!