diff --git a/cmd/web.go b/cmd/web.go
index 97f6a0f15..b335b0cbc 100644
--- a/cmd/web.go
+++ b/cmd/web.go
@@ -99,7 +99,7 @@ func checkVersion() {
 	for _, c := range checkers {
 		if !version.Compare(c.Version(), c.Expected, ">=") {
 			log.Fatal(4, `Dependency outdated!
-Package '%s' current version (%s) is below requirement (%s), 
+Package '%s' current version (%s) is below requirement (%s),
 please use following command to update this package and recompile Gogs:
 go get -u %[1]s`, c.ImportPath, c.Version(), c.Expected)
 		}
@@ -585,12 +585,12 @@ func runWeb(ctx *cli.Context) error {
 			m.Get("/src/*", repo.Home)
 			m.Get("/raw/*", repo.SingleDownload)
 			m.Get("/commits/*", repo.RefCommits)
-			m.Get("/commit/:sha([a-z0-9]{7,40})$", repo.Diff)
+			m.Get("/commit/:sha([a-f0-9]{7,40})$", repo.Diff)
 			m.Get("/forks", repo.Forks)
 		}, context.RepoRef())
-		m.Get("/commit/:sha([a-z0-9]{7,40})\\.:ext(patch|diff)", repo.RawDiff)
+		m.Get("/commit/:sha([a-f0-9]{7,40})\\.:ext(patch|diff)", repo.RawDiff)
 
-		m.Get("/compare/:before([a-z0-9]{7,40})\\.\\.\\.:after([a-z0-9]{7,40})", repo.CompareDiff)
+		m.Get("/compare/:before([a-z0-9]{40})\\.\\.\\.:after([a-z0-9]{40})", repo.CompareDiff)
 	}, ignSignIn, context.RepoAssignment(), repo.MustBeNotBare)
 	m.Group("/:username/:reponame", func() {
 		m.Get("/stars", repo.Stars)