Restrict Possible Usernames: Why does adding a global flag won't work for username = 'RegexGuru'?

JavaScript
1

Your code so far


let username = "JackOfAllTrades11";
let userCheck = /^[a-z]{2,}\d*$/i; // Change this line
let result = userCheck.test(username);
let result1 = username.match(userCheck);
console.log(result1);

Your browser information:

User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.80 Safari/537.36.

Link to the challenge:
https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/regular-expressions/restrict-possible-usernames

2

Because the global flag makes the test method behave differently
You were never taught to use the g flag with the test method because it would be rare to use it that way

If you are interested to know more check the documentation on the test() method

3

Using test() on a regex with the global flag

let userCheck = /^[a-z]{2,}\d*$/ig;

userCheck.test("RegexGuru");
true

userCheck.test("RegexGuru");
false

userCheck.lastIndex=0;

userCheck.test("RegexGuru");
true

Maybe the challenge that explains the test method should be expanded to include a note on the /g flag and lastIndex property