jQuery Youtube URL Validation with regex

Solution 1:

ULTIMATE YOUTUBE REGEX

Cherry picking

Because the explanation is getting longer and longer, I place the final result at the top. Feel free to copy+paste, and go on your way. For a detailed explanation, read _"the full story"_ below.

/**
 * JavaScript function to match (and return) the video Id 
 * of any valid Youtube Url, given as input string.
 * @author: Stephan Schmitz <[email protected]>
 * @url: https://stackoverflow.com/a/10315969/624466
 */
function ytVidId(url) {
  var p = /^(?:https?:\/\/)?(?:www\.)?(?:youtu\.be\/|youtube\.com\/(?:embed\/|v\/|watch\?v=|watch\?.+&v=))((\w|-){11})(?:\S+)?$/;
  return (url.match(p)) ? RegExp.$1 : false;
}

The full story

Amarghosh's regex looks good, at first sight. But it:

doesn't match video id's that include dashes (-),
doesn't validate the id length (v=aa and v=aaaaaaaaaaaaaaaaaa return to be valid),
and doesn't match secured URLs at all (https://youtube.com/watch?valid_params)

To match https, the dash character, and to validate the id length, this was my initial suggestion of a modified version of Amarghosh's regex:

^https?:\/\/(?:www\.)?youtube\.com\/watch\?(?=.*v=((\w|-){11}))(?:\S+)?$

UPDATE 1: URLs versus Strings

After I posted the above pattern, I was asked: "What if the URL is like this;
youtube.com/watch?gl=US&hl=en-US&v=bQVoAWSP7k4"?

First of, please note that this not a URL at all. RFC compliant URLs must start with the scheme! ;)

Anyway, to match any kind of string that indicates to refer to a YouTube video, I updated my answer to exclude the URL scheme being required. So my second suggestion was as follows:

^(?:https?:\/\/)?(?:www\.)?youtube\.com\/watch\?(?=.*v=((\w|-){11}))(?:\S+)?$

UPDATE 2: The ultimate regex

Then I was asked to add support for a "special case"; the youtu.be short urls. Initially I did not add these, since it wasn't specifically part of the question. However I updated my answer now with all possible "special cases". This means that not only have I added support for youtu.be links, but also the request paths "/v" and "/embed".

So, may I introduce: My final and ultimate Youtube regex:

^(?:https?:\/\/)?(?:www\.)?(?:youtu\.be\/|youtube\.com\/(?:embed\/|v\/|watch\?v=|watch\?.+&v=))((\w|-){11})(?:\S+)?$

What strings are matched?

Now this pattern will work for any strings, formatted as follows:

Without scheme and subdomain (Domain: youtu.be, Path: /)

youtu.be/<video:id>

Without scheme, with subdomain (Domain: youtu.be, Path: /)

www.youtu.be/<video:id>

With HTTP scheme, without subdomain (Domain: youtu.be, Path: /)

http://youtu.be/<video:id>

With HTTP scheme and subdomain (Domain: youtu.be, Path: /)

http://www.youtu.be/<video:id>

With HTTPS scheme, without subdomain (Domain: youtu.be, Path: /)

https://youtu.be/<video:id>

With HTTPS scheme and subdomain (Domain: youtu.be, Path: /)

https://www.youtu.be/<video:id>

Without scheme and subdomain (Domain: youtube.com, Path: /embed)

youtube.com/embed/<video:id>   
youtube.com/embed/<video:id>&other_params

Without scheme, with subdomain (Domain: youtube.com, Path: /embed)

www.youtube.com/embed/<video:id>   
www.youtube.com/embed/<video:id>&other_params

With HTTP scheme, without subdomain (Domain: youtube.com, Path: /embed)

http://youtube.com/embed/<video:id>   
http://youtube.com/embed/<video:id>&other_params

With HTTP scheme and subdomain (Domain: youtube.com, Path: /embed)

http://www.youtube.com/embed/<video:id>   
http://www.youtube.com/embed/<video:id>&other_params

With HTTPS scheme, without subdomain (Domain: youtube.com, Path: /embed)

https://youtube.com/embed/<video:id>   
https://youtube.com/embed/<video:id>&other_params

With HTTPS scheme and subdomain (Domain: youtube.com, Path: /embed)

https://www.youtube.com/embed/<video:id>   
https://www.youtube.com/embed/<video:id>&other_params

Without scheme and subdomain (Domain: youtube.com, Path: /v)

youtube.com/v/<video:id>   
youtube.com/v/<video:id>&other_params

Without scheme, with subdomain (Domain: youtube.com, Path: /v)

www.youtube.com/v/<video:id>   
www.youtube.com/v/<video:id>&other_params

With HTTP scheme, without subdomain (Domain: youtube.com, Path: /v)

http://youtube.com/v/<video:id>   
http://youtube.com/v/<video:id>&other_params

With HTTP scheme and subdomain (Domain: youtube.com, Path: /v)

http://www.youtube.com/v/<video:id>   
http://www.youtube.com/v/<video:id>&other_params

With HTTPS scheme, without subdomain (Domain: youtube.com, Path: /v)

https://youtube.com/v/<video:id>   
https://youtube.com/v/<video:id>&other_params

With HTTPS scheme and subdomain (Domain: youtube.com, Path: /v)

https://www.youtube.com/v/<video:id>   
https://www.youtube.com/v/<video:id>&other_params

Without scheme and subdomain (Domain: youtube.com, Path: /watch)

youtube.com/watch?v=<video:id>   
youtube.com/watch?v=<video:id>&other_params   
youtube.com/watch?other_params&v=<video:id> 
youtube.com/watch?other_params&v=<video:id>&more_params

Without scheme, with subdomain (Domain: youtube.com, Path: /watch)

www.youtube.com/watch?v=<video:id>   
www.youtube.com/watch?v=<video:id>&other_params   
www.youtube.com/watch?other_params&v=<video:id>  
www.youtube.com/watch?other_params&v=<video:id>&more_params

With HTTP scheme, without subdomain (Domain: youtube.com, Path: /watch)

http://youtube.com/watch?v=<video:id>   
http://youtube.com/watch?v=<video:id>&other_params   
http://youtube.com/watch?other_params&v=<video:id>   
http://youtube.com/watch?other_params&v=<video:id>&more_params

With HTTP scheme and subdomain (Domain: youtube.com, Path: /watch)

http://www.youtube.com/watch?v=<video:id>   
http://www.youtube.com/watch?v=<video:id>&other_params   
http://www.youtube.com/watch?other_params&v=<video:id>   
http://www.youtube.com/watch?other_params&v=<video:id>&more_params

With HTTPS scheme, without subdomain (Domain: youtube.com, Path: /watch)

https://youtube.com/watch?v=<video:id>   
https://youtube.com/watch?v=<video:id>&other_params   
https://youtube.com/watch?other_params&v=<video:id>   
https://youtube.com/watch?other_params&v=<video:id>&more_params

With HTTPS scheme and subdomain (Domain: youtube.com, Path: /watch)

https://www.youtube.com/watch?v=<video:id>   
https://www.youtube.com/watch?v=<video:id>&other_params   
https://www.youtube.com/watch?other_params&v=<video:id>
https://www.youtube.com/watch?other_params&v=<video:id>&more_params

FUNCTIONAL USAGE

The most easy way to use the pattern, is to wrap it into a function such as this one:

/**
 * JavaScript function to match (and return) the video Id
 * of any valid Youtube Url, given as input string.
 * @author: Stephan Schmitz <[email protected]>
 * @url: https://stackoverflow.com/a/10315969/624466
 */
function ytVidId(url) {
  var p = /^(?:https?:\/\/)?(?:www\.)?(?:youtu\.be\/|youtube\.com\/(?:embed\/|v\/|watch\?v=|watch\?.+&v=))((\w|-){11})(?:\S+)?$/;
  return (url.match(p)) ? RegExp.$1 : false;
}

// for example snippet only!
document.body.addEventListener('click', function(e) {
    if (e.target.className == 'yt-url' && 'undefined' !== e.target.value) {
        var ytId = ytVidId(e.target.value);
        alert(e.target.value + "\r\nResult: " + (!ytId ? 'false' : ytId));
    }
}, false);

<!-- Click the buttons to probe URLs -->
<input type="button" value="https://www.youtube.com/watch?v=p-e2G_VcTms&feature=g-logo&context=G29aead6FOAAAAAAABAA" class="yt-url">
<input type="button" value="https://www.youtube.com/latest" class="yt-url">

If the type of the function's result value must be a boolean value, just replace RegExp.$1 by true. That's it.

One final note on the video Id length: One asked if the ids have a fixed length of 11 chars? and if it might change in the future?

The best answer to that question is probably also the only "official" statement that I've found here and which says: "I don't see anywhere in the documentation where we officially commit to a standard length of 11 characters for YouTube video ids. It's one of those things where we have a current implementation, and it may stay that way indefinitely. But we're not offering any official commitment to that, so proceed at your own risk."

Solution 2:

^http:\/\/(?:www\.)?youtube.com\/watch\?v=\w+(&\S*)?$

//if v can be anywhere in the query list

^http:\/\/(?:www\.)?youtube.com\/watch\?(?=.*v=\w+)(?:\S+)?$

Solution 3:

You can not match the id-part with \w+, as it does not include the dash character (-). [a-zA-Z0-9_-]+ would be something more correct.