/*jshint globalstrict:true*/
'use strict';

var isDefined = angular.isDefined,
  isUndefined = angular.isUndefined,
  isNumber = angular.isNumber,
  isObject = angular.isObject,
  isArray = angular.isArray,
  extend = angular.extend,
  toJson = angular.toJson,
  fromJson = angular.fromJson;


// Test if string is only contains numbers
// e.g '1' => true, "'1'" => true
function isStringNumber(num) {
  return  /^-?\d+\.?\d*$/.test(num.replace(/["']/g, ''));
}