{
    "forbidden": [
        {
            "name": "not-to-sub-except-sub",
            "severity": "error",
            "comment": "everything to paths containing 'sub' is forbidden - except when the path contains 'sub' itself ",
            "from": {
                "pathNot": "\/sub\/"
            },
            "to": {
                "path": "\/sub\/"
            }
        }
    ]
}