String+Extensions.swift

extension String {
    /** Get email addresses in a string, discard any other content. */
    func emailAddresses() -> [String] {
        var addresses = [String]()
        if let detector = try? NSDataDetector(types: NSTextCheckingResult.CheckingType.link.rawValue) {
            let matches = detector.matches(in: self, options: [], range: NSMakeRange(0, self.count))
            for match in matches {
                if let matchURL = match.url,
                    let matchURLComponents = URLComponents(url: matchURL, resolvingAgainstBaseURL: false),
                    matchURLComponents.scheme == "mailto"
                {
                    let address = matchURLComponents.path
                    addresses.append(String(address))
                }
            }
        }
        return addresses
    }
}