(?:\((?P<scope>[a-zA-Z]+(?:-[a-zA-Z]+)*)\))?

            (?:\((?P<scope>[[:alnum:]]+(?:-[[:alnum:]]+)*)\))?

    fn test_with_alnum_scope() {
        let msg = "feat(bar2): add a foo to new bar";
        let commit: Commit = msg.parse().expect("valid");
        assert_eq!(
            commit,
            Commit {
                r#type: Type::Feat,
                scope: Some("bar2".into()),
                breaking: false,
                description: "add a foo to new bar".into(),
                body: None,
                footers: Vec::new()
            }
        );
    }
    #[test]