当用户在 AngularJS 中开始输入(输入字段长度 >0) 时如何检查 ng 模式？

我想检查模式检查输入字段长度是否> 0 我该怎么做.

期望

当输入字段为空时显示所需消息(已触摸(
模式不匹配需要显示请输入有效输入，如果输入字段长度为0需要仅显示所需的消息

(function(angular) {
'use strict';
angular.module('ngMessagesExample', ['ngMessages']);
})(window.angular);

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.1/angular.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.1/angular-messages.js"></script>
<div ng-app='ngMessagesExample'>
<!-- App goes here -->
<form name="test" novalidate ng-submit="test.$valid && submit()">
<div layout-gt-md="row">
<md-input-container class="md-block" flex-gt-xs>
<label>Number</label>
<input  required ng-model="user.number" name="number" ng-pattern="/^[0-9]+(.[0-9]{1,2})?$/" >
<div ng-messages="test.number.$error">
</div>
<div ng-messages="test.$error" ng-show="test.number.$dirty">
<div ng-message="required">number is required</div>
</div>
<span ng-show="!test.number.$valid">Please Enter Valid Input</span>
</md-input-container>
</div>
</form>
</div>

演示

帮帮我

我已经更新了HTML中的代码

<!doctype html>
<html lang="en">
<head>
<script src="//ajax.googleapis.com/ajax/libs/angularjs/1.4.1/angular.min.js"></script>
<script src="//ajax.googleapis.com/ajax/libs/angularjs/1.4.1/angular-messages.js"></script>
<script src="script.js"></script>
</head>
<body>
<div ng-app='ngMessagesExample'>
<!-- App goes here -->
<form name="test" novalidate ng-submit="test.$valid && submit()">
<div layout-gt-md="row">
<md-input-container class="md-block" flex-gt-xs>
<label>Number</label>
<input  required ng-model="user.number" name="number" ng-pattern="/^[0-9]+(.[0-9]{1,2})?$/" >
<div ng-messages="test.number.$error">

</div>
<div ng-messages="test.$error" ng-show="test.number.$dirty"><div ng-message="required">number is required</div></div>
<span ng-show="test.number.$error.pattern">Please Enter Valid Input</span>
</md-input-container>
</div>
</form>
</div>
</body>
</html>

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