Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

JavaScript Regular Expressions in JavaScript Validating a Form Form Validation

Posted by Ewerton Luna
.a{fill-rule:evenodd;}techdegree seal-36
Ewerton Luna
Full Stack JavaScript Techdegree Graduate 24,031 Points

Cannot find the exact pattern the challenge wants me to

I'm getting the message: your regular expression matches the hexadecimal values, but also matches other values. See if you can limit...

Since we assume that the string will always be 7 characters, I can't see where I could improve this regex anymore.

app.js 
// Type inside this function
function isValidHex(text) {
  const hexRegEx = /^#[\da-f]+$/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)";
  }
});

1 Answer

Steven Parker
Steven Parker
231,248 Points
Steven Parker
Steven Parker
231,248 Points

You're really close! But the "+" symbol means "one or more" so, this regex is satisfied with as little as one hex character after a #, and also by a long string of them.

The error message is hinting that you can use another way of indicating that the character class should repeat that would require exactly 6 characters.