If you are looking to set email validation in Wordpress. It has inbuilt functionality for this, Please follow the below example to set email validation, we have set example to check this validation.
$emailAddress = is_email('abcxyz@te###m^p.co*m');
// $emailAddress contain false value for this
$emailAddress = is_email('someone@example.com');
// $emailAddress contain true value for this
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