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Start your free trialMary Pienzi
Full Stack JavaScript Techdegree Student 7,036 PointsRegular Expressions in JavaScript Challenge Task 1 of 2
I'm to build a literal string for the regex that fits the hexadecimal format #0000FF; so far I've got the string i want but the result is coming back stating that I need to limit the selection to fit. It's stating that it can be other values. How can it be other values when I'm telling it to be 0-9a-fA-F. /#[0-9a-fA-F]{6}/i
// Type inside this function
function isValidHex(text) {
const hexRegEx = /\#[0-9a-fA-F]{6}/i;
alert(hexRegEx)
}
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
Zimri Leijen
11,835 PointsBecause your regex will match strings that are longer than 6 characters.
You didn't specify that regex should start looking at the start, or that it should fail the test if the string continues after the end.
So things like wahteverrandomcharactersarehereareignored#5ef345
and #453def2
are valid.
To ensure it correctly cuts off at the beginning and end, use ^ at the start and $ at the end.
Mary Pienzi
Full Stack JavaScript Techdegree Student 7,036 PointsYou are awsome Zimri Leijen Thank you!
Zimri Leijen
11,835 Pointsthanks, and no problem