How does this solution work? (Regex)

JavaScript
#1

solution

let str = “one two three”;
let fixRegex = /(\w+)\s(\w+)\s(\w+)/; // Change this line
let replaceText = “$3 $2 $1”; // Change this line
let result = str.replace(fixRegex, replaceText);

What I don’t understand is how “$3 $2 $1” is able to work. Does $ just automatically refer back to the regex being used in the replace function? What if you wanted to replace with the literal string that contained the dollar sign? i.e “$4 $6 $1”

#2

The parenthesis create capture groups, which are then accessed with $1, $2, $3 (first second, third capture group).

3 Likes
#3

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