#17 YouTube 対応（修正）

frontend/src/components/PostEmbed.tsx

@@ -27,7 +27,7 @@ export default (({ post }: Props) => {
     return <TwitterEmbed userId={userId} statusId={statusId}/>
   case 'youtube.com':
     {
-      const [videoId] = url.pathname.match (/(?<=\/watch\?v\=)[a-zA-Z0-9]+?(?=\/|$|&)/)!
+      const videoId = url.searchParams.get ('v')!
       return (
 	  <YoutubeEmbed videoId={videoId} opts={{ playerVars: {
 	      playsinline:  1,