fixes commentYoutubeRegex with syntax closes #2715

``` https://www.youtube.com/watch?v=dQw4w9WgXcQ ok youtube.com/watch?v=dQw4w9WgXcQ ok youtu.be/dQw4w9WgXcQ ok https://www.youtube.com/v/dQw4w9WgXcQ ok https://www.youtube.com/astanehchess no https://www.youtube.com/c/astanehchess no https://www.youtube.com/channel/UCNB4vCw1iI8c-vMkgPZIz5w no```
lichess-org · Mar 1, 2017 · 19c8253 · 19c8253
1 parent 9153e01
commit 19c8253
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/ui/analyse/src/study/studyComments.js b/ui/analyse/src/study/studyComments.js
@@ -16,7 +16,7 @@ function authorText(author) {
  return author.name;
 }
 
-var commentYoutubeRegex = /(?:https?:\/\/)?(?:www\.)?(?:youtube\.com|youtu\.be)\/(?:watch)?(?:\?v=)?(?:[^"&?\/ ]{11})\S*/gi;
+var commentYoutubeRegex = /(?:https?:\/\/)?(?:www\.)?(?:youtube\.com\/(?:.*?(?:[?&]v=)|v\/)|youtu\.be\/)(?:[^"&?\/ ]{11})\b/gi;
 
 function embedYoutube(text, allowNewlines) {
  var html = lichess.escapeHtml(text).replace(commentYoutubeRegex, function(found) {