Learn Regular Expressions by Building a Spam Filter - Step 20

JavaScript
1

Tell us what’s happening:

Hello, I need help with exercise 20,
I try everything and I can’t do it

Your code so far

<!-- file: index.html -->
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width" />
    <title>Learn Regular Expressions by Building a Spam Filter</title>
    <link rel="stylesheet" href="styles.css" />
  </head>

  <body>
    <header class="main-text">
      <h1 class="title">Is this Spam?</h1>
      <p class="description">
        Enter a phrase to check if it would be marked as spam or not.
      </p>
    </header>

    <main>
      <label class="message-label" for="message-input">Message: </label>
      <textarea
        placeholder="Enter message here"
        value=""
        type="text"
        name="message"
        id="message-input"
        rows="10"
        cols="40"
      ></textarea>
      <button class="btn" id="check-message-btn" type="button">
        Check message
      </button>
      <p id="result"></p>
    </main>

    <footer class="footer">&copy; freeCodeCamp</footer>
    <script src="./script.js"></script>
  </body>
</html>

/* file: script.js */
const messageInput = document.getElementById("message-input");
const result = document.getElementById("result");
const checkMessageButton = document.getElementById("check-message-btn");

const helpRegex = /please help|assist me/i;

// User Editable Region

const dollarRegex = /\s*[0-9]+ (hundred|thousand|million|billion)? dollars\s+/i;

// User Editable Region


const denyList = [helpRegex, dollarRegex];

const isSpam = (msg) => denyList.some((regex) => regex.test(msg));

checkMessageButton.addEventListener("click", () => {
  if (messageInput.value === "") {
    alert("Please enter a message.");
    return;
  }

  result.textContent = isSpam(messageInput.value)
    ? "Oh no! This looks like a spam message."
    : "This message does not seem to contain any spam.";
  messageInput.value = "";
});

/* file: styles.css */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --dark-grey: #1b1b32;
  --light-grey: #f5f6f7;
  --golden-yellow: #fecc4c;
  --yellow: #ffcc4c;
  --gold: #feac32;
  --orange: #ffac33;
  --dark-orange: #f89808;
}

body {
  background-color: var(--dark-grey);
  color: var(--light-grey);
}

body,
#message-input:placeholder-shown {
  text-align: center;
}

textarea {
  max-width: 90%;
}

.main-text {
  margin: 25px 0;
}

.title {
  font-size: 2.5rem;
}

.description {
  margin-top: 15px;
  font-size: 1.4rem;
}

.message-label {
  display: block;
  margin-bottom: 20px;
  font-size: 1.5rem;
}

#message-input:placeholder-shown,
textarea {
  font-size: 1.1rem;
}

.btn {
  display: block;
  cursor: pointer;
  width: 200px;
  margin: 10px auto;
  color: var(--dark-grey);
  background-color: var(--gold);
  background-image: linear-gradient(var(--golden-yellow), var(--orange));
  border-color: var(--gold);
  border-width: 3px;
}

.btn:hover {
  background-image: linear-gradient(var(--yellow), var(--dark-orange));
}

#result {
  font-size: 2rem;
  margin: 20px 0;
}

.footer {
  margin-top: 10px;
}

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36 OPR/112.0.0.0

Challenge Information:

Learn Regular Expressions by Building a Spam Filter - Step 20

1 Like
2

Please reset and try again.
You were supposed to replace the space character between the digit character set and the capture group following it with the backslash s * and the space character between capture group and dollars with another backslash s +

1 Like
3

For anyone else struggling with this one.
Solution:
const dollarRegex = /[0-9]+\s*(hundred|thousand|million|billion)?\s+dollars/i;

2 Likes
4

Hello @t1ng0d!

  1. Firstly you should replace the first literal space between [digit]+ and (dollar|quantity) ? with the \s* expression like that :
    code removed by moderator

  2. Then you should replace the second literal space between (dollar|quantity)? and the word dollars with \s+ like that:
    code removed by moderator

  3. And here you have the final result:
    code removed by moderator

5

hi @JoaniceD

It is great that you solved the challenge, but instead of posting your full working solution, it is best to stay focused on answering the original poster’s question(s) and help guide them with hints and suggestions to solve their own issues with the challenge. How to Help Someone with Their Code Using the Socratic Method

We are trying to cut back on the number of spoiler solutions found on the forum and instead focus on helping other campers with their questions and definitely not posting full working solutions.

1 Like