Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

JavaScript Regular Expressions in JavaScript Validating a Form Form Validation

Chelsea London
seal-mask
.a{fill-rule:evenodd;}techdegree
Chelsea London
Full Stack JavaScript Techdegree Student 9,378 Points

I am confused why this regular expression won't work

  • I eliminate partial matches with ^ and $
  • I include a # sign
  • I include a group of numbers and letters between a and f with [a-f0-9]
  • It needs to match 7 characters with {7}
  • I finish with the case insensitive flag i
app.js
// Type inside this function
function isValidHex(text) {
  var hexRegEx = /^#[a-f0-9]{7}$/i

}

const hex = document.getElementById("hex");
const body = document.getElementsByTagName("body")[0];

hex.addEventListener("input", e => {
  const text = e.target.value;
  const valid = isValidHex(text);
  if (valid) {
    body.style.backgroundColor = "rgb(176, 208, 168)";
  } else {
    body.style.backgroundColor = "rgb(189, 86, 86)";
  }
});
index.html
<!DOCTYPE html>
<html>

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

<body>
    <div id="content">
        <p>Enter a valid hex value below to make the screen turn green.</p>
        <input type="text" id="hex">
    </div>
    <script src="app.js"></script>
</body>

</html>

1 Answer

Try changing 7 to 6.

While there should be a total of 7 characters, there should only be 6 repeats of [a-f0-9].