ultra-design/es/color-picker/utils.js

var hex = /[0-9A-F]/i;
function validHex(value) {
  if (value.startsWith('#')) {
    value = value.slice(1);
    return hex.test(value[value.length - 1]);
  }

  return /\w/i.test(value) && !/\d/.test(value) || value === '';
}

export { validHex };