Fixed RegExp encapsulation bug

libs/markdown.js

@@ -62,17 +62,17 @@ mkdown.renderer.rules.emoji = function (token, idx) {
 const videoRules = [
   {
     selector: 'a.youtube',
-    regexp: new RegExp(/(?:(?:youtu\.be\/|v\/|vi\/|u\/\w\/|embed\/)|(?:(?:watch)?\?v(?:i)?=|&v(?:i)?=))([^#&?]*).*/, 'i'),
+    regexp: new RegExp(/(?:(?:youtu\.be\/|v\/|vi\/|u\/\w\/|embed\/)|(?:(?:watch)?\?v(?:i)?=|&v(?:i)?=))([^#&?]*).*/i),
     output: '<iframe width="640" height="360" src="https://www.youtube.com/embed/{0}?rel=0" frameborder="0" allowfullscreen></iframe>'
   },
   {
     selector: 'a.vimeo',
-    regexp: new RegExp(/vimeo.com\/(?:channels\/(?:\w+\/)?|groups\/(?:[^/]*)\/videos\/|album\/(?:\d+)\/video\/|)(\d+)(?:$|\/|\?)/, 'i'),
+    regexp: new RegExp(/vimeo.com\/(?:channels\/(?:\w+\/)?|groups\/(?:[^/]*)\/videos\/|album\/(?:\d+)\/video\/|)(\d+)(?:$|\/|\?)/i),
     output: '<iframe src="https://player.vimeo.com/video/{0}" width="640" height="360" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>'
   },
   {
     selector: 'a.dailymotion',
-    regexp: new RegExp(/(?:dailymotion\.com(?:\/embed)?(?:\/video|\/hub)|dai\.ly)\/([0-9a-z]+)(?:[-_0-9a-zA-Z]+(?:#video=)?([a-z0-9]+)?)?/, 'i'),
+    regexp: new RegExp(/(?:dailymotion\.com(?:\/embed)?(?:\/video|\/hub)|dai\.ly)\/([0-9a-z]+)(?:[-_0-9a-zA-Z]+(?:#video=)?([a-z0-9]+)?)?/i),
     output: '<iframe width="640" height="360" src="//www.dailymotion.com/embed/video/{0}?endscreen-enable=false" frameborder="0" allowfullscreen></iframe>'
   },
   {