使用或不使用正则表达式提取 YouTube ID

请告诉我如何在不使用正则表达式的情况下获取youtube ID？

使用上述方法以下 URL，没用

http://www.youtube.com/e/dQw4w9WgXcQ

public static String extractYTId(String youtubeUrl) {
    String video_id = "";

    try {
        if(youtubeUrl != null && youtubeUrl.trim().length() > 0 && youtubeUrl.startsWith("http")) {
            String expression = "^.*((youtu.be" + "\\/)" + "|(v\\/)|(\\/u\\/w\\/)|(embed\\/)|(watch\\?))\\??v?=?([^#\\&\\?]*).*"; // var regExp = /^.*((youtu.be\/)|(v\/)|(\/u\/\w\/)|(embed\/)|(watch\?))\??v?=?([^#\&\?]*).*/;
            //String expression = "^.*(?:youtu.be\\/|v\\/|e\\/|u\\/\\w+\\/|embed\\/|v=)([^#\\&\\?]*).*";
            CharSequence input = youtubeUrl;
            Pattern pattern = Pattern.compile(expression, Pattern.CASE_INSENSITIVE);
            Matcher matcher = pattern.matcher(input);
            if(matcher.matches()) {
                String groupIndex1 = matcher.group(7);
                if(groupIndex1 != null && groupIndex1.length() == 11)
                    video_id = groupIndex1;
            }
        }
    } catch(Exception e) {
        Log.e("YoutubeActivity", "extractYTId " + e.getMessage());
    }

    return video_id;
}

其他链接working fine

​​http://www.youtube.com/embed/0zM3nApSvMg?rel=0

http://www.youtube.com/watch?v=0zM3nApSvMg

http://youtu.be/0zM3nApSvMg

http://www.youtube.com/watch?v=0zM3nApSvMg#t=0m10s

http://youtu.be/dQw4w9WgXcQ

http://www.youtube.com/embed/dQw4w9WgXcQ

http://www.youtube.com/v/dQw4w9WgXcQ

http://www.youtube.com/watch?v=dQw4w9WgXcQ

​​​​

您可以使用以下正则表达式

^(?:(?:https?:\/\/)?(?:www\.)?)?(youtube(?:-nocookie)?\.com|youtu\.be)\/.*?(?:embed|e|v|watch\?.*?v=)?\/?([a-z0-9]+)

正则表达式分解：

1. ^: 行的开头anchor
2. (?:(?:https?:\/\/)?(?:www\.)?)?:
   • (?:https?:\/\/)?: Match http:// or https://可选地
   • (?:www\.)?)?: Match www.零次或一次
3. (youtube(?:-nocookie)?\.com|youtu\.be)\/: Match either
   • youtube.com or youtube-nocookie.com or youtu.be其次是/
4. .*?: 懒惰的匹配。匹配直到下一个模式满足。
5. (?:embed|e|v|watch\?.*?v=)?\/?:
   • (?:embed|e|v|watch\?.*?v=)?: Match embed or e or v或来自watch? to v=或无
   • \/?: Match /零次或一次
6. ([a-z0-9]+)：匹配一个或多个字母数字字符并将其添加到捕获的组中。

Live Demo^{Using JavaScript}

var regex = /^(?:(?:https?:\/\/)?(?:www\.)?)?(youtube(?:-nocookie)?\.com|youtu\.be)\/.*?(?:embed|e|v|watch\?.*?v=)?\/?([a-z0-9]+)/i;

// An array of all the youtube URLs
var youtubeLinks = [
    'http://www.youtube.com/e/dQw4w9WgXcQ',
    'http://www.youtube.com/watch?feature=player_embedded&v=dQw4w9WgXcQ',
    'http://www.youtube.com/v/0zM3nApSvMg?fs=1&hl=en_US&rel=0',
    'http://www.youtube.com/embed/0zM3nApSvMg?rel=0',
    'http://www.youtube.com/watch?v=0zM3nApSvMg&feature=feedrec_grec_index',
    'http://www.youtube.com/watch?v=0zM3nApSvMg',
    'http://youtu.be/0zM3nApSvMg',
    'http://www.youtube.com/watch?v=0zM3nApSvMg#t=0m10s',
    'http://youtu.be/dQw4w9WgXcQ',
    'http://www.youtube.com/embed/dQw4w9WgXcQ',
    'http://www.youtube.com/v/dQw4w9WgXcQ',
    'http://www.youtube.com/watch?v=dQw4w9WgXcQ',
    'http://www.youtube-nocookie.com/v/6L3ZvIMwZFM?version=3&hl=en_US&rel=0'
];

// An object to store the results
var youtubeIds = {};

// Iterate over the youtube URLs
youtubeLinks.forEach(function(url) {
    // Get the value of second captured group to extract youtube ID
    var id = "<span class='youtubeId'>" + (url.match(regex) || [0, 0, 'No ID present'])[2] + "</span>";

    // Add the URL and the extracted ID in the result object
    youtubeIds[url] = id;
});

// Log the object in the browser console
console.log(youtubeIds);

// To show the result on the page
document.getElementById('output').innerHTML = JSON.stringify(youtubeIds, 0, 4);

.youtubeId {
    color: green;
    font-weight: bold;
}

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