I need help with the Regular Expressions challenge

JavaScript
1

Tell us what’s happening:
Guys, Im stucked in this Regex lesson, I can’t figure it out why isn’t passing the test. I am doing the same test at Mozilla website and it’s working.

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The solution hint didn’t help me at all, so can someone please explain this?

Thanks

My code so far


let username = "JackOfAllTrades";
let userCheck = /^[a-z]{2,}([a-z0-9]*)/ig; // Change this line
let result = userCheck.test(username);

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.149 Safari/537.36.

Challenge: Restrict Possible Usernames

Link to the challenge:

2

Hi,

I notice you do not pass this test

Z97

do you think your code should pass it?

3

Let me just show you a example that might help you on your way to understanding this. Ok lets say we have a form that you must check if you are only entering text and nothing else.

js:
`
var name = document.getElementById(‘name’);
var RegEx = /^[a-z]{10}$/;
if (!RegEx.test(name.value)) {

   document.getElementById('error').innerHTML = 'Please only text '

    return false;

}
`

4

g flag has a specific use with test method, remove it from your regex
(look at documentation on test method for more infos)

5

Yes, I notice that in this test is not passing.

6

look at this part of the code, what does it do?

^[a-z]{2,}

7

Thank you all guys, I read the explanation more carefully in FCC Guide and I get it.

Code Explanation

1. `^`  - start of input
2. `[a-z]`  - first character is a letter
3. `[0-9]{2,0}`  - ends with two or more numbers
4. `|`  - or
5. `[a-z]+`  - has one or more letters next
6. `\d*`  - and ends with zero or more numbers
7. `$`  - end of input
8. `i`  - ignore case of input

Thanks.

1 Like