Extract YouTube ID with or without RegEx

Question

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

Answer 1

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>