AngularJs input validator directive for text, email and U.S. phone number

inputValidator.js

(function() {
  'use strict';

  function inputValidator($log) {
    var vm, directive, inputType, regex;

    function link(scope, element, attrs, ngModel) {
      vm = scope;

      function init() {

        regex = {
          text : /^[a-zA-Z][a-zA-Z0-9]+$/,
          email : /^[-a-z0-9~!$%^&*_=+}{\'?]+(\.[-a-z0-9~!$%^&*_=+}{\'?]+)*@([a-z0-9_][-a-z0-9_]*(\.[-a-z0-9_]+)*\.(aero|arpa|biz|com|coop|edu|gov|info|int|mil|museum|name|net|org|pro|travel|mobi|[a-z][a-z])|([0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}))(:[0-9]{1,5})?$/i,
          phone : /^[0-9]+$/
        };
        ngModel.$parsers.push(validate);
      };

      function validate(ngModelValue) {
        inputType = attrs.ngType || attrs.type;

        // Custom name validation (value must start with letter)
        if(inputType === 'name') ngModel.$setValidity('invalidName', regex.text.test(ngModelValue));

        // Custom Email validation (*preloaded Angular email validation is passing true value w/o domain extension)
        if(inputType === 'email') ngModel.$setValidity('invalidEmail', regex.email.test(ngModelValue));

        // Custom Phone # validation (Prevent non-numeric character)
        if(inputType === 'phone') {
          var number, formattedNumber, area, front, end;
          
          // Strip out letter first
          formattedNumber = number = String(ngModelValue.replace(/[^0-9]/g, ''));          

          // Also if the first character is '1', strip it out and add it back
          number = number[0] == '1' ? number.slice(1) : number;

          // Mask (###) ###-#### 
          area  = number.substring(0,3);
          front = number.substring(3, 6);
          end   = number.substring(6, 10);
          if (front) formattedNumber = ("(" + area + ") " + front);  
          if (end) formattedNumber += ("-" + end);

          ngModel.$setViewValue(formattedNumber);
          // Send validity (it get you trouble when masked length isn't 14)
          if(formattedNumber.length != 14) ngModel.$setValidity('invalidPhone', false);
          else ngModel.$setValidity('invalidPhone', true);
          ngModel.$render();
        }

        return ngModelValue;
      }

      init();
    }

    directive = {
      link: link,
      restrict: 'A',
      require: 'ngModel',
      scope: {}
    };
    return directive;
  }

  inputValidator.$inject = ['$log'];
  angular
  .module('reserveApp')
  .directive('inputValidator', inputValidator);
})();