Javascript Validators and Formatters

format_number_into_curency.js

//FROM: http://stackoverflow.com/questions/149055/how-can-i-format-numbers-as-money-in-javascript
Number.prototype.formatMoney = function(c, d, t){
  var n = this, 
  c = isNaN(c = Math.abs(c)) ? 2 : c, 
  d = d == undefined ? "." : d, 
  t = t == undefined ? "," : t, 
  s = n < 0 ? "-" : "", 
  i = parseInt(n = Math.abs(+n || 0).toFixed(c)) + "", 
  j = (j = i.length) > 3 ? j % 3 : 0;
  return s + (j ? i.substr(0, j) + t : "") + i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + t) + (c ? d + Math.abs(n - i).toFixed(c).slice(2) : "");
};

(8888.888).format(2, '.', ','); //8,888.88

valid_email_address.js

//FROM: http://stackoverflow.com/questions/46155/validate-email-address-in-javascript
var validEmailAddress = function (email_address) {
    var re = /^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
    return re.test(email_address);
}

valid_na_phone_number.js

//FROM: http://stackoverflow.com/questions/4338267/validate-phone-number-with-javascript
var validPhoneNumber = function(phone_number){
  return /^(\()?[2-9]{1}\d{2}(\))?(-|\s)?[2-9]{1}\d{2}(-|\s)?\d{4}$/.test(phone_number);
}

valid_us_zip_code.js

//FROM: http://stackoverflow.com/questions/160550/zip-code-us-postal-code-validation
var validZipCode = function (zip_code) {
    return /(^\d{5}$)|(^\d{5}-\d{4}$)/.test(zip_code);
}