let countriesStart = {
    "gb": "44",
    "it": "39",
    "ca": "1",
    "se": "46",
    "hk": "852",
    "jp": "81",
    "de": "49",
    "il": "972",
    "pr": "1",
    "mx": "52",
    "au": "61",
    "sg": "65",
    "cn": "86",
    "us": "1",
    "mt": "356"
};

let countriesLenght = {
    "gb": "10",
    "it": "9,13",
    "ca": "10",
    "se": "7,10",
    "hk": "8",
    "jp": "10",
    "de": "10,11",
    "il": "9",
    "pr": "10",
    "mx": "10",
    "au": "9",
    "sg": "8",
    "cn": "11,13",
    "us": "10",
    "mt": "8"
};

function checkPhoneNumber(nation, numberToCheck) {

    numberToCheck = numberToCheck.replaceAll(' ', '');

    if (numberToCheck.startsWith("+")) {
        numberToCheck = numberToCheck.slice(1);

        let regexStartString = '^' + countriesStart[nation];
        let regexLenghtString = '[0-9]{' + countriesLenght[nation] + '}';

        let regexStartEspr = new RegExp(regexStartString);
        let regexLenghtEspr = new RegExp(regexLenghtString);

        let check1 = regexStartEspr.test(numberToCheck);
        numberToCheck = numberToCheck.slice(countriesStart[nation].lenght);
        let check2 = regexLenghtEspr.test(numberToCheck);

        if (check1 == true && check2 == true) {
            return true;
        } else {
            return false;
        }
    }
    return false;
}

function checkPhoneNumberNoNation(numberToCheck) {

    numberToCheck = numberToCheck.replaceAll(' ', '');

    if (numberToCheck.startsWith("+")) {
        numberToCheck = numberToCheck.slice(1);

        for ([key, val] of Object.entries(countriesStart)) {
            let regexStartString = '^' + val;
            let regexLenghtString = '[0-9]{' + countriesLenght[key] + '}';

            let regexStartEspr = new RegExp(regexStartString);
            let regexLenghtEspr = new RegExp(regexLenghtString);

            let check1 = regexStartEspr.test(numberToCheck);
            numberToCheck2 = numberToCheck.slice(val.lenght);
            let check2 = regexLenghtEspr.test(numberToCheck2);

            if (check1 == true && check2 == true) {
                return true;
            }
        }
    }
    return false;
}