Ng-Pattern-3

It sets the pattern validation key if input field data does not match a RegularExpression that is bind to ng-pattern directive(re).

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title></title>
    <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.2/angular.min.js"></script>
</head>
<body ng-app="app">
    <div ng-controller="controllerName">
        <ng-form name="landLineForm">
            Land Line #: <input type="text" ng-model="landLine" name="landLine"  ng-pattern="re" />
            <br />
            <span ng-show="landLineForm.landLine.$error.pattern" style="color:red">Please enter valid Land Line number.</span>
        </ng-form>
    </div>
    <script>
    var app = angular.module("app", []);
    app.controller('controllerName', ['$scope', function ($scope) {
        $scope.re = /^[0-9]\d{2,5}-\d{6,8}$/;
    }]);
</script>
</body>
</html>

Output