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JavaScript Regular Expressions in JavaScript Validating a Form Form Validation

I'm using this code: /[0-9A-Fa-f]{6}/g and thought it was function. I think I may not being declaring properly.

Specifically const hexRegEx = /[0-9A-Fa-f]{6}/g

// Type inside this function
function isValidHex(text) {
const hexRegEx = /#[0-9A-Fa-f]{5}/g;

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>

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

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


1 Answer

Steven Parker
Steven Parker
229,732 Points

You're very close, here's a few hints:

  • the number of characters allowed in question title differs from the code block, be sure to use the right one
  • make sure the color code spans the whole string (from the start to the end)
  • you won't need the "g" option