youtube_link_helper.js

    var YouTubeLink = function(text){
        var self = this;

        self.url = '';

        self.findFirstUrl = function findFirstUrl( text )
        {
            var source = (text || '').toString();
            var url;
            var matchArray;

            var regexToken = /(((ftp|https?):\/\/)[\-\w@:%_\+.~#?,&\/\/=]+)|((mailto:)?[_.\w-]+@([\w][\w\-]+\.)+[a-zA-Z]{2,3})/g;

            while( (matchArray = regexToken.exec( source )) !== null )
            {
                return token = matchArray[0];
            }

            return '';
        }

        self.isStandardLink = function(){
            return (self.url.indexOf('watch') !== -1)
        }

        self.isEmbedLink = function(){
            return (text.indexOf('iframe') !== -1);
        }

        self.isShareLink = function(){
            return (self.url.indexOf('youtu.be') !== -1);
        }

        self.url = self.findFirstUrl(text);

        self.getUrl = function(){
            if(self.isEmbedLink()){
                return self.url;
            }else if(self.isStandardLink()){
                var re = /.*v=(.*)\&?$/;
                var arr = re.exec(self.url);
                return 'http://www.youtube.com/embed/' + arr[1];
            }else if(self.isShareLink()){
                return self.url.substring(str.lastIndexOf('/') + 1); 
            }else{
                return false;
            }
        }
    }