Youtube Video Id from URL - Swift3

Question

Basically I have a Youtube URL as string, I want to extract the video Id from that URL. I found some code in objective c that is as below:

NSError *error = NULL;         


        

Answer 1

Swift 5

var youtubeURLs = [
    "http://www.youtube.com/watch?v=-wtIMTCHWuI",
    "http://www.youtube.com/v/-wtIMTCHWuI?version=3&autohide=1",
    "http://youtu.be/-wtIMTCHWuI",
    "http://www.youtube.com/oembed?url=http%3A//www.youtube.com/watch?v%3D-wtIMTCHWuI&format=json",
    "https://youtu.be/uJ2PZaO1N5E",
    "https://www.youtube.com/embed/M7lc1UVf-VE",
    "http://www.youtube.com/attribution_link?a=JdfC0C9V6ZI&u=%2Fwatch%3Fv%3DEhxJLojIE_o%26feature%3Dshare",
    "https://www.youtube.com/attribution_link?a=8g8kPrPIi-ecwIsS&u=/watch%3Fv%3DyZv2daTWRZU%26feature%3Dem-uploademail"
]

func getVideoID(from urlString: String) -> String? {
    guard let url = urlString.removingPercentEncoding else { return nil }
    do {
        let regex = try NSRegularExpression.init(pattern: "((?<=(v|V)/)|(?<=be/)|(?<=(\\?|\\&)v=)|(?<=embed/))([\\w-]++)", options: .caseInsensitive)
        let range = NSRange(location: 0, length: url.count)
        if let matchRange = regex.firstMatch(in: url, options: .reportCompletion, range: range)?.range {
            let matchLength = (matchRange.lowerBound + matchRange.length) - 1
            if range.contains(matchRange.lowerBound) &&
                range.contains(matchLength) {
                let start = url.index(url.startIndex, offsetBy: matchRange.lowerBound)
                let end = url.index(url.startIndex, offsetBy: matchLength)
                return String(url[start...end])
            }
        }
    } catch {
        print(error.localizedDescription)
    }
    return nil
}

for url in youtubeURLs {
    print("Video id: \(getVideoID(from: url) ?? "NA") for url: \(url)")
}

Result:

Video id: -wtIMTCHWuI for url: http://www.youtube.com/watch?v=-wtIMTCHWuI
Video id: -wtIMTCHWuI for url: http://www.youtube.com/v/-wtIMTCHWuI?version=3&autohide=1
Video id: -wtIMTCHWuI for url: http://youtu.be/-wtIMTCHWuI
Video id: -wtIMTCHWuI for url: http://www.youtube.com/oembed?url=http%3A//www.youtube.com/watch?v%3D-wtIMTCHWuI&format=json
Video id: uJ2PZaO1N5E for url: https://youtu.be/uJ2PZaO1N5E
Video id: M7lc1UVf-VE for url: https://www.youtube.com/embed/M7lc1UVf-VE
Video id: EhxJLojIE_o for url: http://www.youtube.com/attribution_link?a=JdfC0C9V6ZI&u=%2Fwatch%3Fv%3DEhxJLojIE_o%26feature%3Dshare
Video id: yZv2daTWRZU for url: https://www.youtube.com/attribution_link?a=8g8kPrPIi-ecwIsS&u=/watch%3Fv%3DyZv2daTWRZU%26feature%3Dem-uploademail