//javascript
$scope.mobileRegx = "^1(3[0-9]|4[57]|5[0-35-9]|7[01678]|8[0-9])\\d{8}$";
$scope.emailRegx = "^[a-z]([a-z0-9]*[-_]";
$scope.pwdRegx = "[a-zA-Z0-9]*";
<div class="form-group">
<input class="form-control" name="mobile" type="text" ng-model="account.mobile" required ng-pattern="mobileRegx"/>
<span class="error" ng-show="registerForm.$submitted && registerForm.mobile.$error.required">*手机号不能为空</span>
<span class="error" ng-show="registerForm.$submitted && registerForm.mobile.$error.pattern">*手机号地址不合法</span>
</div>
<input type="text" ng-pattern="/[a-zA-Z]/" />

<div class="form-group col-md-6">
<label for="password">
预估时间
</label>
<div class="input-group">
<input required type="number" class="form-control" ng-model="task.estimated_time" name="time" />
<span class="input-group-addon">分钟</span>
</div>
<span class="error" ng-show="newTaskForm.$submitted && newTaskForm.time.$error.required">*请预估时间</span> 
</div>

<input type="email" name="email" ng-model="user.email" />

<input type="url" name="homepage" ng-model="user.facebook_url" />

angular.module('ngMessagesExample', ['ngMessages']);
<form name="myForm">
<label>
Enter your name:
<input type="text"
name="myName"
ng-model="name"
ng-minlength="5"
ng-maxlength="20"
required />
</label>
<pre>myForm.myName.$error = {{ myForm.myName.$error | json }}</pre>
<!--需要配合 ng-if使用，否则一开始就显示出来了, 你摸了就会触发验证--> 
<div ng-messages="myForm.myName.$error" style="color:maroon" role="alert" ng-if="myForm.myName.$touched">
<div ng-message="required">You did not enter a field</div>
<div ng-message="minlength">Your field is too short</div>
<div ng-message="maxlength">Your field is too long</div>
</div>
</form>

<!-- 动态显示状态的负责人 -->
<div class="form-group col-md-6" ng-repeat="sta in task.status_table | orderBy : sta.sequence_order">
<label>{{sta.status_name}} 负责人</label>
<select required class="form-control" ng-model="sta.user_id" ng-options="qa.id as qa.last_name+' '+qa.last_name for qa in taskUserList" name="{{sta.status_name}}">
</select>
<div ng-messages="newTaskForm[sta.status_name].$error" ng-if="newTaskForm.$submitted || newTaskForm[sta.status_name].$touched">
<p class="error" ng-message="required">*请选择负责人</p>
</div>
</div>

<form name="loginForm" novalidate ng-submit="loginPost()" class="navbar-form navbar-right" ng-hide="login">
<fake-autocomplete></fake-autocomplete>
<div class="form-group">
<input name="user_name" required maxlength="50" type="text" class="form-control" placeholder="手机号或邮箱" ng-model="account.user_name" ng-class="{warn:loginForm.$submitted && loginForm.user_name.$error.required}">
</div>
<div class="form-group">
<input name="password" required type="password" maxlength="50" placeholder="密码" ng-model="account.password" ng-class="{'form-control':1,warn:loginForm.$submitted && loginForm.password.$error.required}">
</div>
<button type="submit" class="btn btn-default"><span class="glyphicon glyphicon-lock"></span> 登录</button>
</form>
.warn {
border-color: #f78d8d !important;
outline: 0 !important;
-webkit-box-shadow: inset 0 1px 1px rgba(0, 0, 0, .075), 0 0 8px rgb(239, 154, 154) !important;
box-shadow: inset 0 1px 1px rgba(0, 0, 0, .075), 0 0 8px rgba(239, 154, 154) !important;
}