Regular Expressions: Restrict Possible Usernames Nathaniel

Tell us what’s happening:
I have been trying to solve the Regular Expression for checking possible usernames, but it seem like i have not gotten it.

Your code so far

let username = "JackOfAllTrades";
let userCheck = /[a-zA-Z]/gi ; // Change this line
let result = userCheck.test(username);

The above takes care of about 80% of the required format leaving only the ones that ends with numbers.

But cracking that has been hectic.

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Challenge: Restrict Possible Usernames

Link to the challenge:

Think back to the previous challenges. How do you define a number (or digit) in your regex?