Angular 2表单验证模式正则表达式错误

Question

我正在创建一个角度的表单,要求name字段只包含字母数字字符和空格.为此,我使用pattern属性:

<input type="text" class="form-control" placeholder="Name" name="Name" [(ngModel)]="name" required pattern="/^[a-z\d-_\s]+$/i" #nameField="ngModel">

当字符串不匹配时,我想要显示以下错误消息:

<div *ngIf="nameField.errors">
   <div [hidden]="!nameField.errors.pattern">
       <p class="has-error">
          Only spaces, letters, and numbers are allowed.
       </p>
   </div>
</div>

但是,即使字符串与正则表达式匹配,我仍然可以看到错误消息.有任何想法吗？

Answer 1

我想这里的问题是正则表达式的语法没有正确形成:

 <form novalidate #f="ngForm" novalidate>
    <input type="text" 
    class="form-control" 
    placeholder="Name" name="Name" 
    [(ngModel)]="name" 
    required pattern="^[A-Z\\a-z\\d-_\\s]+$" 
    #nameField="ngModel" >
    <div>
      <div *ngIf="nameField.errors?.pattern">
        <p class="has-error">
          Only spaces, letters, and numbers are allowed.
        </p>
        hame: {{nameField.errors | json}}
     </div>
    </div>
  </form>

看看这个plunkr