how to validate email in html code example

Example 1: how to validate mail adress css

<form>
	<input pattern="/^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9-]+(?:\.[a-zA-Z0-9-]+)*$/" required />
	<br />
	<input type="submit" value="Submit Now!">
</form>

Example 2: how to validate mail adress css

<form>
	<input type="email" required /> <br />
	<input type="submit" value="Submit Now!">
</form>