currencyUtils.js

var currencySymbols = {
  USD: "$"
};

var delimiters = {
  USD: ","
};

var separators = {
  USD: "."
};

function getDollars(currency, amountString) {
  var delimiter = delimiters[currency];
  var dollars = amountString.match(new RegExp(`^(?:\\D*)([0-9${delimiter}]+)`));
  dollars = (dollars && dollars[1]) ? dollars[1] : "0";
  dollars = dollars.replace(new RegExp(`${delimiter}`, 'g'), '');
  return parseInt(dollars, 10);
}

function getCents(currency, amountString) {
  var separator = separators[currency];
  var cents = amountString.match(new RegExp(`[${separator}]([0-9]{0,2}).*$`));
  cents = (cents && cents[1]) ? cents[1] : "0";
  return parseInt(cents, 10);
}

function validateFormat(currency, amountString) {
  var symbol = currencySymbols[currency],
      delimiter = delimiters[currency],
      separator = separators[currency];

  var regex = new RegExp(`^[${symbol}]{0,1}[0-9${delimiter}]+[${separator}]{0,1}[0-9]*$`);
  return regex.test(amountString);
}

function toCents(currency, amountString) {
  var dollars = getDollars(currency, amountString);
  var cents = getCents(currency, amountString);
  return (dollars * 100) + cents;
}
    
function validateFormat(currency, amountString) {
  return validateFormat(currency, amountString);
}