Ticket #17287: 17287.2.diff

wp-includes/ms-functions.php

@@ -644 +644 @@
         if (! is_subdomain_install() )
                 $illegal_names = array_merge($illegal_names, apply_filters( 'subdirectory_reserved_names', array( 'page', 'comments', 'blog', 'files', 'feed' ) ) );
 
-
         if ( empty( $blogname ) )
                 $errors->add('blogname', __('Please enter a site name'));
 
-        $maybe = array();
-        preg_match( '/[a-z0-9]+/', $blogname, $maybe );
-        if ( $blogname != $maybe[0] )
+        if ( preg_match( '/[^a-z0-9]+/', $blogname ) )
                 $errors->add('blogname', __('Only lowercase letters and numbers allowed'));
 
         if ( in_array( $blogname, $illegal_names ) == true )