Unbreak normal `git fetch` command with URL and refspec

Fixes #1243

commands/fetch.go

@@ -48,7 +48,7 @@ func tranformFetchArgs(args *Args) error {
 	currentProject, currentProjectErr := localRepo.CurrentProject()
 
 	projects := make(map[*github.Project]bool)
-	ownerRegexp := regexp.MustCompile(OwnerRe)
+	ownerRegexp := regexp.MustCompile(fmt.Sprintf("^%s$", OwnerRe))
 	for _, name := range names {
 		if ownerRegexp.MatchString(name) && !isCloneable(name) {
 			_, err := localRepo.RemoteByName(name)

features/fetch.feature

@@ -15,6 +15,12 @@ Feature: hub fetch
     Then the git command should be unchanged
     And there should be no output
 
+  Scenario: Fetch from non-GitHub source via refspec
+    Given the "origin" remote has url "ssh://dev@codeserver.dev.xxx.drush.in/~/repository.git"
+    When I successfully run `hub fetch ssh://myusername@a.specific.server:1234/existing-project/gerrit-project-name refs/changes/16/6116/1`
+    Then the git command should be unchanged
+    And there should be no output
+
   Scenario: Fetch from local bundle
     Given the GitHub API server:
       """