gistfile1.txt

    Might be this will helpful to remove error:
    
    func isMatch(regex: String, options: NSRegularExpressionOptions) -> Bool
    {
        var error: NSError?
        var exp = NSRegularExpression(pattern: regex, options: options, error: &error)
        if let error = error {
            println(error.description)
        }
        var matchCount = exp?.numberOfMatchesInString(self, options: nil, range: NSMakeRange(0, self.length))
        return matchCount > 0
    }
    func getMatches(regex: String, options: NSRegularExpressionOptions) -> [NSTextCheckingResult]
    {
        var error: NSError?
        var exp = NSRegularExpression(pattern: regex, options: options, error: &error)
        if let error = error {
            println(error.description)
        }
        var matches = exp?.matchesInString(self, options: nil, range: NSMakeRange(0, self.length))
        return matches as [NSTextCheckingResult]
    }