diff --git a/osbase/oci/registry/server.go b/osbase/oci/registry/server.go
index 13a9dc2..9c99c40 100644
--- a/osbase/oci/registry/server.go
+++ b/osbase/oci/registry/server.go
@@ -53,10 +53,10 @@
 //
 // If the tag is empty, the image can only be fetched by digest.
 func (s *Server) AddImage(repository string, tag string, image *oci.Image) error {
-	if !repositoryRegexp.MatchString(repository) {
+	if !RepositoryRegexp.MatchString(repository) {
 		return fmt.Errorf("invalid repository %q", repository)
 	}
-	if tag != "" && !tagRegexp.MatchString(tag) {
+	if tag != "" && !TagRegexp.MatchString(tag) {
 		return fmt.Errorf("invalid tag %q", tag)
 	}