Description is hard to understand. What is nth?

[rigo205]

Tell us what’s happening:

replaceText should use parenthesized submatch string(s) (i.e. the nth parenthesized submatch string, $n, corresponds to the nth capture group)

Your code so far

let str = "one two three";
let fixRegex = /change/; // Change this line
let replaceText = ""; // Change this line
let result = str.replace(fixRegex, replaceText);

Your browser information:

User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.80 Safari/537.36

Challenge: Use Capture Groups to Search and Replace

Link to the challenge:

freeCodeCamp.org

[Slimattcode]

@rigo205

replaceText should use parenthesized submatch string(s) (i.e. the nth parenthesized submatch string, $n, corresponds to the nth capture group)

This is just to say that for example $2, refers to the 2nd capture group in the regex. You are given this example:

"Code Camp".replace(/(\w+)\s(\w+)/, '$2 $1');

Good luck. Hope this helps.

[DanCouper]

Can Anyone Explain. What is the "$1 $2" in first replace statement of solution 1?

It’s the first and the second capturing groups. In regex, you can put a pattern in brackets (()). The brackets specify a capturing group: whatever matches in that group is “captured”, and then you can use $1, $2 etc to access the first, second etc groups. /([a-z])([A-Z])/g So this captures one character a-z, one character A-Z If the whole pattern matches, you can then use the reference to the relevant capturing group str = str.replace(/([a-z])([A-Z])/g, "$1 $2");