detecting multimedia

multi.js

$['Redactor']['fn']['formatLinkify'] = function (protocol, convertLinks, convertImageLinks, convertVideoLinks) {
    var url1 = /(^|<|\s)(www\..+?\..+?)(\s|>|$)/g,
        url2 = /(^|<|\s)(((https?|ftp):\/\/|mailto:).+?)(\s|>|$)/g,
        urlImage = /(https?:\/\/.*\.(?:png|jpg|jpeg|gif))/gi,
        urlYoutube = /^.*(youtu.be\/|v\/|u\/\w\/|embed\/|watch\?v=|\&v=)([^#\&\?]*).*/,
        urlVimeo = /http:\/\/(www\.)?vimeo.com\/(\d+)($|\/)/;
    var childNodes = (this['$editor'] ? this['$editor']['get'](0) : this)['childNodes'],
        i = childNodes['length'];
    while (i--) {
        var n = childNodes[i];
        if (n['nodeType'] === 3) {
            var html = n['nodeValue'];
            if (convertVideoLinks && html) {
                var iframeStart = '<iframe width="500" height="281" src="',
                    iframeEnd = '" frameborder="0" allowfullscreen></iframe>';
                if (html['match'](urlYoutube)) {
                    html = html['replace'](urlYoutube, iframeStart + '//www.youtube.com/embed/$2' + iframeEnd);
                    $(n)['after'](html)['remove']();
                } else {
                    if (html['match'](urlVimeo)) {
                        html = html['replace'](urlVimeo, iframeStart + '//player.vimeo.com/video/$2' + iframeEnd);
                        $(n)['after'](html)['remove']();
                    };
                };
            };
            if (convertImageLinks && html && html['match'](urlImage)) {
                html = html['replace'](urlImage, '<img src="$1">');
                $(n)['after'](html)['remove']();
            };
            if (convertLinks && html && (html['match'](url1) || html['match'](url2))) {
                var href = (html['match'](url1) || html['match'](url2));
                href = href[0];
                if (href['length'] > 50) {
                    href = href['substring'](0, 50) + '...';
                };
                html = html['replace'](/&/g, '&amp;')['replace'](/</g, '&lt;')['replace'](/>/g, '&gt;')['replace'](url1, '$1<a href="' + protocol + '$2">' + href + '</a>$3')['replace'](url2, '$1<a href="$2">' + href + '</a>$5');
                $(n)['after'](html)['remove']();
            };
        } else {
            if (n['nodeType'] === 1 && !/^(a|button|textarea)$/i ['test'](n['tagName'])) {
                $['Redactor']['fn']['formatLinkify']['call'](n, protocol, convertLinks, convertImageLinks, convertVideoLinks);
            };
        };
    };
};