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

Some samples of Youtube's url:

let urls: [String] = [
    "www.youtube-nocookie.com/embed/up_lNV-yoK4?rel=0",
    "http://www.youtube.com/watch?v=peFZbP64dsU",
    "http://www.youtube.com/watch?v=cKZDdG9FTKY&feature=channel",
    "http://youtube.com/v/dQw4w9WgXcQ?feature=youtube_gdata_player",
    "http://youtube.com/?v=dQw4w9WgXcQ&feature=youtube_gdata_player",
    "http://youtu.be/6dwqZw0j_jY",
    "http://youtu.be/dQw4w9WgXcQ?feature=youtube_gdata_playe",
    "http://youtube.com/vi/dQw4w9WgXcQ?feature=youtube_gdata_player",
    "http://youtube.com/?vi=dQw4w9WgXcQ&feature=youtube_gdata_player",
    "http://youtube.com/watch?vi=dQw4w9WgXcQ&feature=youtube_gdata_player",
    "http://www.youtube.com/user/Scobleizer#p/u/1/1p3vcRhsYGo?rel=0",
    "http://www.youtube.com/user/SilkRoadTheatre#p/a/u/2/6dwqZw0j_jY",
    "1p3vcRhsY02"
]

My extension based on Islam Q. solution:

private extension String {
    var youtubeID: String? {
        let pattern = "((?<=(v|V|vi)/)|(?<=be/)|(?<=(\\?|\\&)v=)|(?<=vi=)|(?<=/u/[0-9_]/)|(?<=embed/))([\\w-]++)"
        let regex = try? NSRegularExpression(pattern: pattern, options: .caseInsensitive)
        let range = NSRange(location: 0, length: count)

        guard let result = regex?.firstMatch(in: self, range: range) else {
            return count == 11 ? self : nil
        }

        let id = (self as NSString).substring(with: result.range)
        return id.count == 11 ? id : nil
    }
}