E-mail Regular Expression (Regex) Pattern PCRE

email_regex_test.php

<?php
$sPattern = '^[^<>()[\]\\.,;:\s@"]+(?:\.[^<>()[\]\\.,;:\s@"]+)*@(?:xn--)?[a-zA-Z][a-zA-Z\d]*(?:-[a-zA-Z\d]+)*\.(?!local)[a-zA-Z]{2,32}(?:\.[a-zA-Z]{2})?$';
//
$sSubject = 'john.doe@example.org';
//
$aMatches = [];
if (preg_match($sPattern, $sSubject, $aMatches)) {
    echo 'ok';
}
else {
    echo 'oops!';
}