An angular ng-patter is check the matching value of input string in directive and return a form validation. Ng-pattern is value match logic are applied form user input on DOM End. I set the pattern value is amazon while enter the input box value is amazon mean return true from form validation other than false. HTML: <div ng-app="PatternApp"> <div ng-controller="PtrnCtrl"> <form name="ptrfrm"> <input type="text" ng-model="model" id="input" name="input" ng-pattern="ptrn" /><br> Result==> {{ptrfrm.input.$valid}} </form> </div> Angular: var app = angular.module('PatternApp',[]); app.controller('PtrnCtrl', function($scope){ $scope.ptrn = "amazon"; }); Result: Demo