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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
231,248 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
231,248 PointsJoseph Monreal — Glad to help. You can mark a question solved by choosing a "best answer".
And happy coding!