Fix - Incorrect youtube video URL

regex update and cleanup

lib/youtube-dl.js

@@ -23,7 +23,7 @@ fs.exists(file, function(exists) {
 
 var progressRegex = /(\d+(?:\.\d)?)% of (\d+\.\d+\w+) at\s+([^\s]+) ETA ((\d|-)+:(\d|-)+)/;
 
-var isYouTubeRegex = /^(https?:\/\/www\.|https?:\/\/)?(youtube\.com|youtu\.be)\//;
+var isYouTubeRegex = /^(https?:\/\/)?(www\.)?(youtube\.com|youtu\.be)\//;
 
 // check if win
 var isWin = /^win/.test(process.platform);
@@ -52,10 +52,8 @@ exports.download = function(urladdr, dest, args) {
  // Get possible IDs.
  var id = query.v || '';
 
- // Check for youtube video url.
- var isYouTube = isYouTubeRegex.test(urladdr);
-
- if (isYouTube && !id) {
+ // Check for long and short youtube video url.
+ if (!id && isYouTubeRegex.test(urladdr)) {
  // Get possible IDs for youtu.be from urladdr.
  id = details.pathname.slice(1);
  }