Livevalidation setting youtube url validator

I am using livevalidation to validate a form input field where it asks for a youtube video url and I am trying to create a url rule so that it validates when the user inputs http://www.youtube.com/watch?v=11chars. I tried to combine the partialmatch option in the link above like so:

var link = new LiveValidation('link');
开发者_运维百科link.add( Validate.Inclusion, { within: [ 'http://' , 'www', 'youtube.com/watch?v=' ], partialMatch: true } )

and combine it with this length example:

var link = new LiveValidation('link');
link.add( Validate.Length, { minimum: 50, maximum: 50 } );

but obviously this looks clumsy and I dont think it'll be very effective if it worked properly.

Is there a possible way to combine some of the examples from the link above to validate the youtube url properly? Thanks for the help!

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Use Validate.Format with a regular expression:

 link.add(Validate.Format, { pattern: /^http\:\/\/www\.youtube\.com\/watch\?v=[a-z0-9]{11}$/i });

Edit: To validate links with additional query parameters, you can use something like this:

/^http\:\/\/www\.youtube\.com\/watch\?v=[a-z0-9]{11}(&.*)?$/i

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link.add(Validate.Format, { pattern: /^http\:\/\/www\.youtube\.com\/watch\?v=[a-zA-Z0-9---_]{11}$/ }); 

this works! didnt know I could just use regex to do it so I tweaked @gilly3 code a bit

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Here's a regex that validates for both your JavaScript & PHP, and does it for three kinds of URLs: the classic (?v=), the AJAXed one (#!v=) and the short version (youtu.be). It also supports international URLs.

/http:\/\/(?:youtu\.be\/|(?:[a-z]{2,3}\.)?youtube\.com\/watch(?:\?|#\!)v=)([\w-]{11}).*/gi

Code snippet found on Snipplr :)