Question

基本上我有一个Youtube URL作为字符串，我想从该URL中提取视频ID。我在目标c中找到了一些如下代码：

NSError *error = NULL;
NSRegularExpression *regex = 
[NSRegularExpression regularExpressionWithPattern:@"?.*v=([^&]+)"
                                          options:NSRegularExpressionCaseInsensitive
                                            error:&error];
NSTextCheckingResult *match = [regex firstMatchInString:youtubeURL
                                                options:0
                                                  range:NSMakeRange(0, [youtubeURL length])];
if (match) {
    NSRange videoIDRange = [match rangeAtIndex:1];
    NSString *substringForFirstMatch = [youtubeURL substringWithRange:videoIDRange];
}

当我将此代码转换为swift3时：

var error: Error? = nil
var regex = try! NSRegularExpression(pattern: "?.*v=([^&]+)", options: .caseInsensitive)
var match = regex!.firstMatch(in: youtubeURL, options: [], range: NSRange(location: 0, length: youtubeURL.length))!
if match {
    var videoIDRange = match.rangeAt(1)
    var substringForFirstMatch = (youtubeURL as NSString).substring(with: videoIDRange)
}

给出错误：

致命错误：'试试！'表达式意外地引发了错误：错误Domain = NSCocoaErrorDomain Code = 2048“值”？。* v =（[^＆amp;] +）“无效。”

任何人都可以帮我解决这个错误，或者任何人解释如何从Swift 3中的url获取视频ID。

提前致谢

Answer 1

Swift 3/4 准备就绪和 更安全 版本（不强行展开!）：

extension String {
    var youtubeID: String? {
        let pattern = "((?<=(v|V)/)|(?<=be/)|(?<=(\\?|\\&)v=)|(?<=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 nil
        }

        return (self as NSString).substring(with: result.range)
    }
}

示例：

"https://www.youtube.com/watch?v=C0DPdy98e4c".youtubeID // "C0DPdy98e4c"
"https://youtube.com/watch?v=C0DPdy98e4c".youtubeID // "C0DPdy98e4c"
"www.youtube.com/watch?v=C0DPdy98e4c".youtubeID // "C0DPdy98e4c"
"youtube.com/watch?v=C0DPdy98e4c".youtubeID // "C0DPdy98e4c"

"https://youtu.be/C0DPdy98e4c".youtubeID // "C0DPdy98e4c"
"youtu.be/C0DPdy98e4c".youtubeID // "C0DPdy98e4c"

致谢：Usman Nisar's answer

Answer 2

我使用URLComponents有不同的方法。然后，您只需从URL中选择“v”参数（如果存在）。

func getYoutubeId(youtubeUrl: String) -> String? {
    return URLComponents(string: youtubeUrl)?.queryItems?.first(where: { $0.name == "v" })?.value
}

然后传入Youtube网址：

print (getYoutubeId(youtubeUrl: "https://www.youtube.com/watch?v=Y7ojcTR78qE&spfreload=9"))

Answer 3

以下是从任何youtube网址中提取YouTube视频ID的代码：（SWIFT）

func extractYoutubeId(fromLink link: String) -> String {
        let regexString: String = "((?<=(v|V)/)|(?<=be/)|(?<=(\\?|\\&)v=)|(?<=embed/))([\\w-]++)"
        let regExp = try? NSRegularExpression(pattern: regexString, options: .caseInsensitive)
        let array: [Any] = (regExp?.matches(in: link, options: [], range: NSRange(location: 0, length: (link.characters.count ))))!
        if array.count > 0 {
            let result: NSTextCheckingResult? = array.first as? NSTextCheckingResult
            return (link as NSString).substring(with: (result?.range)!)
        }

        return ""
    }

Answer 4

Swift 4版，使用优雅的flatMap：

func extractYouTubeId(from url: String) -> String? {
    let typePattern = "(?:(?:\\.be\\/|embed\\/|v\\/|\\?v=|\\&v=|\\/videos\\/)|(?:[\\w+]+#\\w\\/\\w(?:\\/[\\w]+)?\\/\\w\\/))([\\w-_]+)"
    let regex = try? NSRegularExpression(pattern: typePattern, options: .caseInsensitive)
    return regex
        .flatMap { $0.firstMatch(in: url, range: NSMakeRange(0, url.count)) }
        .flatMap { Range($0.range(at: 1), in: url) }
        .map { String(url[$0]) }
}

此方法使用正则表达式检测大多数可能的YouTube网址格式（.be/*，/embed/，/v/ - 您可以找到完整列表here。 / p>

Answer 5

您的第一个问题是您没有在表达式中转义?。 ?是保留字符，如果您想在表达式中使用它，则必须使用\进行转义，因为\也用于转义"字符，您必须转义{ {1}}使用双反斜杠，例如?。因此根据以上信息，以下代码正确提取videoId

\\?

Answer 6

雨燕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)")
}

结果：

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

Answer 7

要从Youtube Url获取视频ID，请使用代码＃Swift4 ：

var videoId = ""

    if youtubeLink.lowercased().contains("youtu.be"){
            linkString = youtubeLink
            if let range = linkString.range(of: "be/"){
                videoId = youtubeLink[range.upperBound...].trimmingCharacters(in: .whitespaces)
            }
        }
        else if youtubeLink.lowercased().contains("youtube.com"){
            linkString = youtubeLink
            if let range = linkString.range(of: "?v="){
                videoId = youtubeLink[range.upperBound...].trimmingCharacters(in: .whitespaces)
            }
        }

希望会有所帮助！：）

Answer 8

Youtube网址的一些示例：

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"
]

我基于Islam Q.解决方案的扩展程序：

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
    }
}

来自网址的Youtube视频ID - Swift3

8 个答案: