Regex exercise question

JavaScript
#1

Tell us what’s happening:

I don’t understand why this solution works for the challenge. Instead of using (?=\w{5,}) I was using (?=\w{6,}) because in the instructions it says the password string should only match if it is least six characters long.

Your code so far


let sampleWord = "astronaut";
let pwRegex = /^\D(?=\w{5,})(?=\w+\d{2})/; // Change this line
let result = pwRegex.test(sampleWord);

Your browser information:

User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.122 Safari/537.36.

Challenge: Positive and Negative Lookahead

Link to the challenge:
https://www.freecodecamp.org/learn/javascript-algorithms-and-data-structures/regular-expressions/positive-and-negative-lookahead

#2

JS is 0 based. it means it starts counting from 0.
When you are specifying 6 in your Regex, you’re basically asking it for at least 7.

#3

and you are right, but it passes the same, there are no tests for a string of length 5 so I never solved my doubt for this challenge.

that’s not true, when counting stuff it counts from 1 (like in an array, you have items at index 0,1 and 2 - the length of the array is 3)

#4

I’m aware of that.
The only explanation that made sense to me was that. if it’s not true, I’ll look into it further and find out the reason.

#5

both pass because there is no test for a string of length five, only of length six of above.
The challenge instructions could be interpreted both as “at least 5 characters”, or “at least 6 characters” by people.
There is not a test that specify which is the correct one.

you can open a bug for this if you want

Thank you for helping make FCC better. Bugs can be reported as GitHub Issues. Whenever reporting a bug, please check first that there isn’t already an issue for it and provide as much detail as possible.

#6

I see.
Thanks for making the time to look it up!

#7