Check if a value is a valid hexadecimal color code

Code snippet to test if a string value is in the proper hexadecimal color format.

const isHexColor = (hex) => {
  const regex = /^#?([0-9A-Fa-f]{6}|[0-9A-Fa-f]{3})$/;
  return regex.test(hex);
}

This function returns true or false depending if the value passed in follows the hexadecimal color code syntax.