diff --git a/version.go b/version.go
index 09703e8..1d96a6f 100644
--- a/version.go
+++ b/version.go
@@ -18,9 +18,10 @@ var (
 // The raw regular expression string used for testing the validity
 // of a version.
 const (
-	VersionRegexpRaw string = `v?([0-9]+(\.[0-9]+)*?)` +
+	VersionRegexpRaw string = `[vV]?([0-9]+(\.[0-9]+)*?)` +
 		`(-([0-9]+[0-9A-Za-z\-~]*(\.[0-9A-Za-z\-~]+)*)|(-?([A-Za-z\-~]+[0-9A-Za-z\-~]*(\.[0-9A-Za-z\-~]+)*)))?` +
 		`(\+([0-9A-Za-z\-~]+(\.[0-9A-Za-z\-~]+)*))?` +
+		`([\+\.\-~]g[0-9A-Fa-f]{10}$)?` +
 		`?`
 
 	// SemverRegexpRaw requires a separator between version and prerelease
diff --git a/version_test.go b/version_test.go
index cbbeac8..37a2553 100644
--- a/version_test.go
+++ b/version_test.go
@@ -34,6 +34,7 @@ func TestNewVersion(t *testing.T) {
 		{"1.7rc2", false},
 		{"v1.7rc2", false},
 		{"1.0-", false},
+		{"2.28.0.618.gf4bc123cb7", false},
 	}
 
 	for _, tc := range cases {