Possible Usernames Restricted

i used the hints solution to pass this test. i understand how it fulfills all the conditions but i don’t understand how it fits the last condition. I think there is a problem somewhere
4. Usernames have to be at least two characters long. A two-character username can only use alphabet letters as characters.

Your code so far

let username = "JackOfAllTrades";
let userCheck = /^[a-z][a-z]+\d*$|^[a-z]\d\d+$/i;
// Change this line
let result = userCheck.test(username);

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:101.0) Gecko/20100101 Firefox/101.0

Challenge: Restrict Possible Usernames

Link to the challenge:

please i need a reply

What specifically is it that you do not understand?

aa will match, a will not match, a2 will also not match.

Try using a site like regex101 or regexr, put in the regex, and look at the explanation.