--- /dev/null
+// Copyright (C) The Arvados Authors. All rights reserved.
+//
+// SPDX-License-Identifier: AGPL-3.0
+
+
+const ERROR_MESSAGE = 'Remote host is invalid';
+
+export const isRemoteHost = (value: string) => {
+ return value.match(/\w+\.\w+\.\w+/i) ? undefined : ERROR_MESSAGE;
+};