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// Copyright 2012 Google Inc. All rights reserved.
// Use of this source code is governed by the Apache 2.0
// license that can be found in the LICENSE file.
package appengine
import (
// Namespace returns a replacement context that operates within the given namespace.
func Namespace(c context.Context, namespace string) (context.Context, error) {
if !validNamespace.MatchString(namespace) {
return nil, fmt.Errorf("appengine: namespace %q does not match /%s/", namespace, validNamespace)
return internal.NamespacedContext(c, namespace), nil
// validNamespace matches valid namespace names.
var validNamespace = regexp.MustCompile(`^[0-9A-Za-z._-]{0,100}$`)