js email regular expression EMAIL输入验证

https://stackoverflow.com/questions/46155/how-to-validate-an-email-address-in-javascript

 angular

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<div class="form-group">

<label>email</label>

<input type="email" [(ngModel)]="user.email"

[ngClass]="{'is-invalid':userEmail.errors && userEmail.touched}"

class="form-control"

name="email"

#userEmail="ngModel"

required

pattern="[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?">

<div [hidden]="!userEmail.errors?.required" class="invalid-feedback">

Email address required

 

 

</div>

<div

[hidden]="!userEmail.errors?.pattern"

class="invalid-feedback">

Email is not valid

 

 

</div>

 

</div>