Index: src/wp-admin/includes/class-wp-press-this.php
===================================================================
--- src/wp-admin/includes/class-wp-press-this.php	(revision 31611)
+++ src/wp-admin/includes/class-wp-press-this.php	(working copy)
@@ -419,6 +419,8 @@
 			$src = 'https://vimeo.com/' . (int) $src_matches[1];
 		} else if ( preg_match( '/\/\/vine\.co\/v\/([^\/]+)\/embed/', $src, $src_matches ) ) {
 			$src = 'https://vine.co/v/' . $src_matches[1];
+		} else if ( preg_match( '/\/\/(www\.)?dailymotion\.com\/embed\/video\/([^\/\?]+)([\/\?]{1}.+)?/', $src, $src_matches ) ) {
+			$src = 'https://www.dailymotion.com/video/' . $src_matches[2];
 		} else if ( ! preg_match( '/\/\/(m\.|www\.)?youtube\.com\/watch\?/', $src )
 		            && ! preg_match( '/\/youtu\.be\/.+$/', $src )
 		            && ! preg_match( '/\/\/vimeo\.com\/[\d]+$/', $src )