What is ng-pattern? How to use ng-pattern in AngularJs?

The ng-pattern is used to validate the input field with the help of regular expressions. Its return true if field is validate as per expressions otherwise return false.

The example in detail as given below

The AngularJs code-sample

var app = angular.module("myApp", []);
        app.controller("myCtrl", function ($scope) {
            $scope.IsValid = function () {
                alert("Price Is valid and form  is submitted.");
            }
        });

The HTML code-sample

<div ng-app="myApp">
    <div ng-controller="formCtrl">
        <form name="valForm" ng-submit="IsValid()">
            <input type="number" ng-model="val" name="val" ng-pattern="/^\d{0,9}(\.\d{1,9})?$/" required>
            <input type="submit" value="submit" />
        </form>
    </div>
</div>

The Live demo code-sample

<!DOCTYPE html>
<html>
<head>
    <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.13/angular.js"></script>
    <script>
        var app = angular.module("myApp", []);
        app.controller("myCtrl", function ($scope) {
            $scope.IsValid = function () {
                alert("Price Is valid and form  is submitted.");
            }
        });
    </script>
</head>
<body ng-app="myApp">
    <div ng-controller="formCtrl">
        <form name="valForm" ng-submit="IsValid()">
            <input type="number" ng-model="val" name="val" ng-pattern="/^\d{0,9}(\.\d{1,9})?$/" required>
            <input type="submit" value="submit" />
        </form>
    </div>
</body>
</html>

The output:

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