StatusCodeChecker should use rules based on regexp URLs instead of paths

[cristiingineru]

The rules of the StatusCodeChecker can be expressed in 4 ways, example:

{
    "code": 200,
    "exceptions": {
        "/": 301,
        "/contact": [
            301,
            302
        ],
        "/product-\d*": {
            "regexp": true,
            "code": 301
        },
        "/item-\d*": {
            "regexp": true,
            "code": [301, 302]
        }
    }
}

Switching to regexp URLs instead of paths will enable writing more precise and clear rules like this:

{
    "code": 200,
    "exceptions": {
        "https://www\.domain\.com/": 301,
        "https://sub1\.domain\.com/": 301,
        "https://sub2\.domain\.com/": 302,
        "https://.*\.domain\.com/product-\d*": 301,
        "https://sub1\.domain\.com/item-\d*": 301,
        "https://sub2\.domain\.com/item-\d*": 302
    }
}