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JavaScript Regular Expressions in JavaScript Reformatting User Input Reformatting Text

Brian Foley
Brian Foley
8,440 Points

RegExp challenge question stuck

I'm kind of swinging in the dark here. Here's the challenge:

This challenge contains a form that will accept a first and last name (separated with a space), and display the last name first, then a comma, then the first name. Your challenge is to create a variable newText, and assign a replacement string to that variable. Be careful to match the exact variable name, because that's what is passed into replace(). You'll also need to reference the values captured by the parentheses in the regex.

I went with const newText = '$2 $1'; but that's not it. Any ideas? Thanks for the help!

function reformatName(text) {
  const rawName = /^(\w+)\s(\w+)$/;

  // Type your answer on line 5, below:
  const newText = '$2 $1'; 

  return text.replace(rawName, newText);

const form = document.querySelector("form");
const input = form.querySelector("input");
const reformatted = document.getElementById("reformatted");

form.addEventListener("submit", e => {
  reformatted.textContent = reformatName(input.value);
<!DOCTYPE html>

    <title>DOM Manipulation</title>
<link rel="stylesheet" href="style.css" />

    <div id="content">
            <label for="name">Enter your first and last name, please.</label>
            <br />
            <input type="text" id="name" name="name">
            <button type="submit">Reformat</button>
            <h2>Reformatted name:</h2>
                <p id="reformatted"></p>
    <script src="app.js"></script>


5 Answers

Steven Parker
Steven Parker
228,026 Points

You're close, but you overlooked part of the instructions, which said, "display the last name first, then a comma, then the first name".

You got the names in the right order, but you forgot the comma.

Brain is right. this worked for me:

const newText = "$2 , $1";

Mourad Gharsalli
Mourad Gharsalli
9,065 Points

I tried it mine still does not work what's the problem const newText = '$2,$1' ;

Steven Parker
Steven Parker
228,026 Points

The challenge does want to see a space after the comma.

I tried it mine still does not work const newText = "$2 , $1"; \ what is wrong?

Brian Foley
Brian Foley
8,440 Points

Hi James, delete that space after the 2 :)

This is what worked for me:

let newText = '$2, $1'; 
Make sure there is a space only after the comma.