properly escape dot in soundcloud url regex

embed.php

@@ -83,7 +83,7 @@ add_action('wp', 'register_embed_handlers');
 /* Noembed -- list selected from https://noembed.com/providers */
 $noembed = 'https://noembed.com/embed';
 $noembed_site = array(
-    "https?://soundcloud.com/.*/.*",
+    "https?://soundcloud\\.com/.*",   
     "https?://www\\.urbandictionary\\.com/define\\.php\\?term=.+",
     "https?://(?:www\\.)?vimeo\\.com/.+",
     "https?://(?:www\\.)?xkcd\\.com/\\d+/?",