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
Joseph Monreal
Full Stack JavaScript Techdegree Student 10,075 PointsRegEx
// Type inside this function function isValidHex(text) { let hexRegEx = /^#\d{3}[A-Za-z]\d{1}[A-Za-z]$/; // Not Working return hexRegEx.test(text); }
const hex = document.getElementById("hex"); const body = document.getElementsByTagName("body")[0];
hex.addEventListener("input", e => { const text = e.target.value; const valid = isValidHex(text); if (valid) { body.style.backgroundColor = "rgb(176, 208, 168)"; } else { body.style.backgroundColor = "rgb(189, 86, 86)"; } });
// Type inside this function
function isValidHex(text) {
let hexRegEx = /^#\d{3}[A-Za-z]\d{1}[A-Za-z]$/;
return hexRegEx.test(text);
}
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)";
}
});
<!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>
2 Answers
Steven Parker
231,275 PointsLet's break down the regex you show here:
- ^#
starting with a # sign...
- \d{3}
- [A-Za-z]
- \d{1}
- [A-Za-z]$
So this would allow "#802B3C" but not "#00FF00" (pure green). And it would allow "#123J4W" (not hex)
The actual regex you want is much simpler:
- start with the # sign (that part was OK)
- then allow characters that can be a digit OR a letter, but only up to "F"
- and specifically six of those
Joseph Monreal
Full Stack JavaScript Techdegree Student 10,075 PointsThank you Steven.
Steven Parker
231,275 PointsJoseph Monreal — Glad to help. You can mark a question solved by choosing a "best answer".
And happy coding!