Question

我找到了两个有用的javascript正则表达式，但它们似乎都没有在Swift上运行。

这适用于Youtube网址，但不适用于Vimeo和DailyMotion。 Vimeo＆amp; Dailymotion正则表达式适用于javascript。

谢谢你们。

**编辑解决方案**

感谢GreatBigBore和Larme

private func getVendorId(_ regexStr:String, _ videoUrl:String, _ search:[Int]) -> String {

    let regex = try? NSRegularExpression(pattern: regexStr, options: .caseInsensitive)
    let result:[NSTextCheckingResult] = (regex?.matches(in: videoUrl, options: [], range: NSRange(location: 0, length: (videoUrl.characters.count ))))!

    if result.count > 0 {
        let groups = result.first!;
        for i in search {
            if (groups.rangeAt(i).length != 0) {
                return (videoUrl as NSString).substring(with: groups.rangeAt(i))
            }
        }
    }

    return "";
}

override func viewDidLoad() {

    let youtubeUrl   = "https://www.youtube.com/watch?v=MCc0V5bgEF8";
    let youtubeRegex = "((?<=(v|V)/)|(?<=be/)|(?<=(\\?|\\&)v=)|(?<=embed/))([\\w-]++)";
    let youtubeId    = getVendorId(youtubeRegex, youtubeUrl, [0]);
    print("YOUTUBE ID -> \(youtubeId)")

    let vimeoUrl    = "https://player.vimeo.com/video/233459603";
    let vimeoRegex  = "https?:\\/\\/(?:www\\.|player\\.)?vimeo.com\\/(?:channels\\/(?:\\w+\\/)?|groups\\/([^\\/]*)\\/videos\\/|album\\/(\\d+)\\/video\\/|video\\/|)(\\d+)(?:$|\\/|\\?)";
    let vimeoId     = getVendorId(vimeoRegex, vimeoUrl, [2]);
    print("VIMEO ID -> \(vimeoId)")

    let dailyMotionUrl   = "http://www.dailymotion.com/hub/x9q_Galatasaray";
    let dailyMotionRegex = "^.+dailymotion.com\\/(video|hub)\\/([^_]+)[^#]*(#video=([^_&]+))?";
    let dailyMotionId    = getVendorId(dailyMotionRegex, dailyMotionUrl, [4, 2]);
    print("DAILYMOTION ID -> \(dailyMotionId)")


    super.viewDidLoad()

}

Answer 1

你的正则表达式正常。问题是你没有考虑多个捕获组。您的变量result将包含每个捕获组的NSRange;您需要从其中一个获取已捕获的ID，而不是result?.range。这是一些示例代码，向您展示我的意思。在getId()之后将其添加到let result功能：

print("Capture group count", result!.numberOfRanges)

for i in 0 ..< result!.numberOfRanges {
    if result!.range(at: i).length == 0 {
        print("Group \(i) is empty")
    } else {
        print("Group \(i) captured", (url as NSString).substring(with: result!.range(at: i)))
    }
}

我不清楚为什么你的youtube id会以它的方式捕获;我认为它与所有后视镜头有关（我不是后视专家）。但问题不在于你的正则表达式;只需要从捕获组中获取您的ID，而不是直接从regRes.first获取。

REGEX获得Vimeo＆amp; Dailymotion ID

1 个答案: