Regular Expressions - Restrict Possible Usernames

Tell us what’s happening:
Helpp, not passing test 1,3,4 and 5.

Your code so far

let username = "JackOfAllTrades";
let userCheck = /^\D[\w.?]\d$/gi; // Change this line
let result = userCheck.test(username);
console.log(result);

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.36

Challenge: Regular Expressions - Restrict Possible Usernames

Link to the challenge:

do you understand why those strings should get the result you are asked to return?