freeCodeCamp/curriculum/challenges/02-javascript-algorithms-and-data-structures/regular-expressions/Use Capture Groups to Search and Replace.md

id, title, challengeType

id	title	challengeType
587d7dbb367417b2b2512bab	Use Capture Groups to Search and Replace	1

Description

Searching is useful. However, you can make searching even more powerful when it also changes (or replaces) the text you match. You can search and replace text in a string using .replace() on a string. The inputs for .replace() is first the regex pattern you want to search for. The second parameter is the string to replace the match or a function to do something.

let wrongText = "The sky is silver.";
let silverRegex = /silver/;
wrongText.replace(silverRegex, "blue");
// Returns "The sky is blue."

You can also access capture groups in the replacement string with dollar signs ($).

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

Instructions

Write a regex so that it will search for the string "good". Then update the replaceText variable to replace "good" with "okey-dokey".

Tests

- text: You should use <code>.replace()</code> to search and replace.
  testString: 'assert(code.match(/\.replace\(.*\)/), "You should use <code>.replace()</code> to search and replace.");'
- text: Your regex should change <code>"This sandwich is good."</code> to <code>"This sandwich is okey-dokey."</code>
  testString: 'assert(result == "This sandwich is okey-dokey." && replaceText === "okey-dokey", "Your regex should change <code>"This sandwich is good."</code> to <code>"This sandwich is okey-dokey."</code>");'
- text: You should not change the last line.
  testString: 'assert(code.match(/result\s*=\s*huhText\.replace\(.*?\)/), "You should not change the last line.");'

Challenge Seed

let huhText = "This sandwich is good.";
let fixRegex = /change/; // Change this line
let replaceText = ""; // Change this line
let result = huhText.replace(fixRegex, replaceText);

Solution

// solution required