diff --git a/utils.go b/utils.go
index c3ff632..f48f29a 100644
--- a/utils.go
+++ b/utils.go
@@ -213,23 +213,23 @@ func init() {
 	sb := &strings.Builder{}
 
 	// Start with group 1 - those that started with `^`
-	sb.WriteString("(?:^(?:")
+	sb.WriteString("(?:^(?:(?:")
 	sb.WriteString(caretStrings[0])
 	for _, matcher := range caretStrings[1:] {
 		sb.WriteString(")|(?:")
 		sb.WriteString(matcher)
 	}
-	sb.WriteString("))")
+	sb.WriteString(")))")
 	sb.WriteString("|")
 
 	// Now add group 2 - those that started with `(^|/)`
-	sb.WriteString("(?:(?:^|/)(?:")
+	sb.WriteString("(?:(?:^|/)(?:(?:")
 	sb.WriteString(caretSegmentStrings[0])
 	for _, matcher := range caretSegmentStrings[1:] {
 		sb.WriteString(")|(?:")
 		sb.WriteString(matcher)
 	}
-	sb.WriteString("))")
+	sb.WriteString(")))")
 	sb.WriteString("|")
 
 	// Finally add the rest
diff --git a/utils_test.go b/utils_test.go
index 56fc4c9..fd031ab 100644
--- a/utils_test.go
+++ b/utils_test.go
@@ -17,6 +17,7 @@ func TestIsVendor(t *testing.T) {
 		expected bool
 	}{
 		{"cache/", true},
+		{"something_cache/", false},
 		{"random/cache/", true},
 		{"cache", false},
 		{"dependencies/", true},
@@ -27,6 +28,7 @@ func TestIsVendor(t *testing.T) {
 		{"random/dist/", true},
 		{"random/dist", false},
 		{"deps/", true},
+		{"foodeps/", false},
 		{"configure", true},
 		{"a/configure", true},
 		{"config.guess", true},
@@ -43,6 +45,7 @@ func TestIsVendor(t *testing.T) {
 		{"foo/bar/MochiKit.js", true},
 		{"foo/bar/dojo.js", true},
 		{"foo/env/whatever", true},
+		{"some/python/venv/", false},
 		{"foo/.imageset/bar", true},
 		{"Vagrantfile", true},
 	}