HTML5 Email Validation

2018-07-03 08:21:54

It is said "With HTML5, we need no more js or a server side code to check if the user's input is a valid email or url address"

How can I validate email after a user enter? and without JS how to display a message if the user enter a wrong form of his/her email address.

<input type="email" pattern="[^ @]*@[^ @]*" placeholder="Enter your email">
<input type="submit" value="Submit">

In HTML5 you can do like this:

<form>
<input type="email" placeholder="Enter your email">
<input type="submit" value="Submit">
</form>

And when the user press submit, it automatically shows an error message like:

The input type=email page of the www.w3.org site notes that an email address is any string which matches the following regular expression:

/^[a-zA-Z0-9.!#$%&’*+/=?^_`{|}~-]+@[a-zA-Z0-9-]+(?:.[a-zA-Z0-9-]+)*$/

Use the required attribute and a pattern attribute to require the value to match the regex pattern.

<input
    type="text"
    pattern="/^[a-zA-Z0-9.!#$%&’*+/=?^_`{|}~-]+@[a-zA-Z0-9-]+(?:.[a-zA-Z0-9-]+)*$/"
    required
>

使用[a-zA-Z0-9.-_]{1,}@[a-zA-Z.-]{2,}[.]{1}[a-zA-Z]{2,}为somemail@email.com / somemail@email.com.vn

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