Ticket #47003: 47003.4.diff

src/wp-includes/ms-functions.php

@@ -473 +473 @@
         $user_name     = preg_replace( '/\s+/', '', sanitize_user( $user_name, true ) );
 
         if ( $user_name != $orig_username || preg_match( '/[^a-z0-9]/', $user_name ) ) {
-                $errors->add( 'user_name', __( 'Usernames can only contain lowercase letters (a-z) and numbers.' ) );
+                $errors->add( 'user_name', __( 'Usernames can only contain lowercase letters (a-z) and numbers (0-9).' ) );
                 $user_name = $orig_username;
         }
 

src/wp-includes/rest-api/endpoints/class-wp-rest-users-controller.php

@@ -1246 +1246 @@
                 if ( ! validate_username( $username ) ) {
                         return new WP_Error(
                                 'rest_user_invalid_username',
-                                __( 'Username contains invalid characters.' ),
+                                __( 'Usernames can only contain lowercase letters (a-z) and numbers (0-9).' ),
                                 array( 'status' => 400 )
                         );
                 }

src/wp-includes/user.php

@@ -2513 +2513 @@
         if ( '' === $sanitized_user_login ) {
                 $errors->add( 'empty_username', __( 'Please enter a username.' ) );
         } elseif ( ! validate_username( $user_login ) ) {
-                $errors->add( 'invalid_username', __( 'This username is invalid because it uses illegal characters. Please enter a valid username.' ) );
+                $errors->add( 'invalid_username', __( 'Usernames can only contain lowercase letters (a-z) and numbers (0-9).' ) );
                 $sanitized_user_login = '';
         } elseif ( username_exists( $sanitized_user_login ) ) {
                 $errors->add( 'username_exists', __( 'This username is already registered. Please choose another one.' ) );