斯卡拉正则表达式的YouTube视频ID

Question

我试图使用提取自YouTube网址视频ID如下：

val YoutubeRegex = """v=([^&]+)""".r 

    "v=IQJ13vFYOU8&feature=g-all-lik" match { 
    case YoutubeRegex(videoId) => videoId 
    case _ => throw new NoSuchFieldError("impossible to find youtube Id") 
    } 

Saddly这不工作...任何想法？非常感谢

Answer 1

是不是应该这样？

val YoutubeRegex = """v=([^&]+).*""".r // need to specify that there could be remainder 

"v=IQJ13vFYOU8&feature=g-all-lik" match { 
    case YoutubeRegex(videoId) => videoId 
    case _ => throw new NoSuchFieldError("impossible to find youtube Id") 
} 

所以你会得到IQJ13vFYOU8部分，而不选择。