function checkRegistration(inputArr){
    const workingArr = inputArr.slice();
    let regCount = 0;
    let totalInputs = Number(workingArr.shift());
    for (let i = 0; i < totalInputs; i++){
        let userRegXep = /^(U\$)(?<username>[A-Z][a-z]{2,})\1(P@\$)(?<password>[A-Za-z]{5,}\d+)\3$/g;
        const passedValues = userRegXep.exec(workingArr[i]);
        if (passedValues !== null){
            regCount++;
            let {username, password} = passedValues.groups;
            console.log("Registration was successful");
            console.log(`Username: ${username}, Password: ${password}`);
        }
        else {
            console.log("Invalid username or password");
        }
    }
    console.log(`Successful registrations: ${regCount}`);
}