使用或不使用RegEx提取YouTube ID [英] Extract YouTube ID with or without RegEx

问题描述

请让我知道如何在不使用正则表达式的情况下获取youtube ID?

在网址后使用上述方法，无效

Please let me know how to get youtube ID without going to regular expression?

Using above method following URL, didn't work

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

http://www.youtube.com/watch?feature=player_embedded&v=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;
}

Other links working fine

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

解决方案

You can use following RegEx

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

RegEx Breakup:

1. ^: Start of the line anchor
2. (?:(?:https?:\/\/)?(?:www\.)?)?:
   • (?:https?:\/\/)?: Match http:// or https:// optionally
   • (?:www\.)?)?: Match www. zero or one time
3. (youtube(?:-nocookie)?\.com|youtu\.be)\/: Match either
   • youtube.com or youtube-nocookie.com or youtu.be followed by /
4. .*?: Lazy match. Match until the next pattern satisfies.
5. (?:embed|e|v|watch\?.*?v=)?\/?:
   • (?:embed|e|v|watch\?.*?v=)?: Match embed or e or v or from watch? to v= or nothing
   • \/?: Match / zero or one time
6. ([a-z0-9]+): Match one or more alphanumeric characters and add that in the captured group.

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;
}

<pre id="output"></pre>

这篇关于使用或不使用RegEx提取YouTube ID的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！