Clarification on constraint and of one challenge test

In the challenge, the last constraint states: usernames have to be at least two characters long. A two-character username can only use alphabet letters as characters.

Though in the challenge checks one of them has to match with “Z97” which violates that constraint. Am I wrong or not?

Your code so far

let username = "Z97";
let userCheck = /^[a-z][a-z]+\d*$|^[a-z]\d\d+$/gi; 
let result = userCheck.test(username);

^[a-z][a-z]+    check two+ letters at the beginning
\d*$.           if any number, then must be at the end
|^[a-z]\d\d+$   OR, any letter at the beginning with 2 or more digits at the end
gi             checking for more instances of char and ignoring letter case

Challenge: Restrict Possible Usernames

Link to the challenge:

it’s more than two characters long so it doesn’t have the constraint of having only letters, and it respects the fact that it starts with a letter and the numbers are only at the end

Okay thanks a bunch!