Ticket #20019: wp-ms-dotdash.patch

wp-includes/ms-functions.php

@@ -561 +561 @@
         if ( empty( $blogname ) )
                 $errors->add('blogname', __('Please enter a site name'));
 
-        if ( preg_match( '/[^a-z0-9]+/', $blogname ) )
-                $errors->add('blogname', __('Only lowercase letters and numbers allowed'));
+        if ( preg_match( '/[^a-z0-9\.\-]+/', $blogname ) )
+                $errors->add('blogname', __('Only lowercase letters, numbers, dash and period allowed'));
 
         if ( in_array( $blogname, $illegal_names ) == true )
                 $errors->add('blogname',  __('That name is not allowed'));