NSRegularExpression non-capture group

var regex = NSRegularExpression(pattern: "(?:Status:)on", options: nil, error: nil)
var str = "Status:on" as NSString

var range = NSRange(location: 0, length: str.length)

var match = regex?.firstMatchInString(str, options: nil, range: range)
var stringMatch = str.substringWithRange(match!.range)

// stringMatch = "Status:on"