foreach({
  'noop': noop,

  'regexp': function(value, regexp, msg) {
    if (!value.match(regexp)) {
      return msg ||
        "Value does not match expected format " + regexp + ".";
    } else {
      return null;
    }
  },

  'number': function(value, min, max) {
    var num = 1 * value;
    if (num == value) {
      if (typeof min != 'undefined' && num < min) {
        return "Value can not be less than " + min + ".";
      }
      if (typeof min != 'undefined' && num > max) {
        return "Value can not be greater than " + max + ".";
      }
      return null;
    } else {
      return "Not a number";
    }
  },

  'integer': function(value, min, max) {
    var numberError = angularValidator['number'](value, min, max);
    if (numberError) return numberError;
    if (!("" + value).match(/^\s*[\d+]*\s*$/) || value != Math.round(value)) {
      return "Not a whole number";
    }
    return null;
  },

  'date': function(value, min, max) {
    if (value.match(/^\d\d?\/\d\d?\/\d\d\d\d$/)) {
      return null;
    }
    return "Value is not a date. (Expecting format: 12/31/2009).";
  },

  'ssn': function(value) {
    if (value.match(/^\d\d\d-\d\d-\d\d\d\d$/)) {
      return null;
    }
    return "SSN needs to be in 999-99-9999 format.";
  },

  'email': function(value) {
    if (value.match(/^[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$/)) {
      return null;
    }
    return "Email needs to be in username@host.com format.";
  },

  'phone': function(value) {
    if (value.match(/^1\(\d\d\d\)\d\d\d-\d\d\d\d$/)) {
      return null;
    }
    if (value.match(/^\+\d{2,3} (\(\d{1,5}\))?[\d ]+\d$/)) {
      return null;
    }
    return "Phone number needs to be in 1(987)654-3210 format in North America or +999 (123) 45678 906 internationaly.";
  },

  'url': function(value) {
    if (value.match(/^(ftp|http|https):\/\/(\w+:{0,1}\w*@)?(\S+)(:[0-9]+)?(\/|\/([\w#!:.?+=&%@!\-\/]))?$/)) {
      return null;
    }
    return "URL needs to be in http://server[:port]/path format.";
  },

  'json': function(value) {
    try {
      fromJson(value);
      return null;
    } catch (e) {
      return e.toString();
    }
  },

  'asynchronous': function(text, asynchronousFn) {
    var element = this['$element'];
    var cache = element.data('$validateState');
    if (!cache) {
      cache = { state: {}};
      element.data('$validateState', cache);
    }
    var state = cache.state[text];
    cache.lastKey = text;
    if (state === undefined) {
      // we have never seen this before, Request it
      element.addClass('ng-input-indicator-wait');
      state = cache.state[text] = null;
      (asynchronousFn || noop)(text, function(error){
        state = cache.state[text] = error ? error : false;
        if (cache.state[cache.lastKey] !== null) {
          element.removeClass('ng-input-indicator-wait');
        }
        elementError(element, NG_VALIDATION_ERROR, error);
      });
    }

    if (state === null){
      // request in flight, mark widget invalid, but don't show it to user
      (this['$invalidWidgets']||[]).push(this.$element);
    }
    return state;
  }

}, function(v,k) {angularValidator[k] = v;});