Index: wp-includes/class-oembed.php
--- wp-includes/class-oembed.php
+++ wp-includes/class-oembed.php
@@ -33,7 +33,7 @@
 			'#http://(www\.)?youtube.com/watch.*#i'              => array( 'http://www.youtube.com/oembed',                     true  ),
 			'http://youtu.be/*'                                  => array( 'http://www.youtube.com/oembed',                     false ),
 			'http://blip.tv/*'                                   => array( 'http://blip.tv/oembed/',                            false ),
-			'#http://(www\.)?vimeo\.com/.*#i'                    => array( 'http://vimeo.com/api/oembed.{format}',              true  ),
+			'#https?://(www\.)?vimeo\.com/.*#i'                  => array( 'http://vimeo.com/api/oembed.{format}',              true  ),
 			'#http://(www\.)?dailymotion\.com/.*#i'              => array( 'http://www.dailymotion.com/services/oembed',        true  ),
 			'#http://(www\.)?flickr\.com/.*#i'                   => array( 'http://www.flickr.com/services/oembed/',            true  ),
 			'#http://(.+\.)?smugmug\.com/.*#i'                   => array( 'http://api.smugmug.com/services/oembed/',           true  ),