freeCodeCamp/guide/english/certifications/javascript-algorithms-and-data-structures/regular-expressions/restrict-possible-usernames/index.md

title

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Restrict Possible Usernames

Restrict Possible Usernames

Solution:

let username = "JackOfAllTrades";
let userCheck = /^[a-z]{2,}\d*$/i;
let result = userCheck.test(username);

Explain:

1. The only numbers in the username have to be at the end. \d$ There can be zero or more of them at the end. *

/\d*$/;

2. Username letters can be lowercase and uppercase. i

/\d*$/i;

3. Usernames have to be at least two characters long. {2,} A two-letter username can only use alphabet letter characters. ^[a-z]

/^[a-z]{2,}\d*$/i;