RegEx possible?

JavaScript
#1

Tell us what’s happening:

Your code so far


let repeatNum = "4212 4212 4212";
let reRegex = /^(\d+)(\s\1)\2$/; // Change this line
let result = reRegex.test(repeatNum);
let res2 = repeatNum.match(reRegex);
console.log(result);
console.log(res2);

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.129 Safari/537.36.

Challenge: Reuse Patterns Using Capture Groups

Link to the challenge:

#2

Hello!

I apologise, but I am not quite sure what you are asking here.

#3

can this also be a possible answer?

#4

Your regex returns the correct values for all of the test strings, but does not meet the Your regex should have two spaces separating the three numbers. test.

#5

yeah but when i use capture groups for the second one it must capture a space and \d

#6

Think about what capture groups are.
(\d+) is a capture group. (\d+)(\d+) is two capture groups.
What if you wanted a space between your capture groups?

#7

See \d+ will capture a number second capture group will capture a space and a number. so its like a number space a number space a number

#8

Great! So how would you write that as a Regex?

#9

that’s what i wrote i think

#10

Your Regex works for the test strings. But how would you change it to reuse a capture group twice? That’s the one test you’re missing.

#11

but it is right for the requirements that’s the point i was asking

#12

It will correctly test the strings for a number repeated three times with a space between each repetition, yes.

But it is not correct for the challenge requirements, no.

#13

thanks for clarification

1 Like
#14

Always happy to help! :slight_smile:

#15