cmd/go/internal/get: fix regexes for "any" character matching

Minor bug: `hubajazz.net` and `gitbapache.org` would match, probably shouldn't

GitHub-Last-Rev: 75bd338569ca41f83b9c36fe3d5ae3b4db0a26cc
GitHub-Pull-Request: golang/go#23755
Change-Id: Ie9c9ab1c15364eccdab8cf3b106b9c370e7f532f
Reviewed-on: https://go-review.googlesource.com/92997
Run-TryBot: Andrew Bonventre <andybons@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/cmd/go/internal/get/vcs.go

@@ -971,7 +971,7 @@ var vcsPaths = []*vcsPath{
 	// IBM DevOps Services (JazzHub)
 	{
 		prefix: "hub.jazz.net/git/",
-		re:     `^(?P<root>hub.jazz.net/git/[a-z0-9]+/[A-Za-z0-9_.\-]+)(/[A-Za-z0-9_.\-]+)*$`,
+		re:     `^(?P<root>hub\.jazz\.net/git/[a-z0-9]+/[A-Za-z0-9_.\-]+)(/[A-Za-z0-9_.\-]+)*$`,
 		vcs:    "git",
 		repo:   "https://{root}",
 		check:  noVCSSuffix,
@@ -980,7 +980,7 @@ var vcsPaths = []*vcsPath{
 	// Git at Apache
 	{
 		prefix: "git.apache.org/",
-		re:     `^(?P<root>git.apache.org/[a-z0-9_.\-]+\.git)(/[A-Za-z0-9_.\-]+)*$`,
+		re:     `^(?P<root>git\.apache\.org/[a-z0-9_.\-]+\.git)(/[A-Za-z0-9_.\-]+)*$`,
 		vcs:    "git",
 		repo:   "https://{root}",
 	},

src/cmd/go/internal/get/vcs_test.go

@@ -59,6 +59,10 @@ func TestRepoRootForImportPath(t *testing.T) {
 			"hub.jazz.net",
 			nil,
 		},
+		{
+			"hubajazz.net",
+			nil,
+		},
 		{
 			"hub2.jazz.net",
 			nil,
@@ -140,6 +144,10 @@ func TestRepoRootForImportPath(t *testing.T) {
 			"git.apache.org/package-name/path/to/lib",
 			nil,
 		},
+		{
+			"gitbapache.org",
+			nil,
+		},
 		{
 			"git.apache.org/package-name.git",
 			&repoRoot{