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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
229,644 Points
Steven Parker
Steven Parker
229,644 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.