Fix mismatch between Q2A and PHPMailer email validation algorithm

qa-include/app/emails.php

@@ -135,6 +135,7 @@ function qa_send_email($params)
 
 	require_once QA_INCLUDE_DIR . 'vendor/PHPMailer/PHPMailerAutoload.php';
 
+	PHPMailer::$validator = 'php';
 	$mailer = new PHPMailer();
 	$mailer->CharSet = 'utf-8';
 

qa-include/util/string.php

@@ -736,7 +736,7 @@ function qa_email_validate($email)
 {
 	if (qa_to_override(__FUNCTION__)) { $args=func_get_args(); return qa_call_override(__FUNCTION__, $args); }
 
-	return preg_match("/^[\-\!\#\$\%\&\'\*\+\/\=\?\_\`\{\|\}\~a-zA-Z0-9\.\^]+\@[a-zA-Z0-9\-]+\.[a-zA-Z0-9\.\-]+$/", $email) === 1;
+	return (bool)filter_var($email, FILTER_VALIDATE_EMAIL);
 }
 
 

qa-tests/UtilStringTest.php

@@ -126,13 +126,14 @@ class UtilStringTest extends PHPUnit_Framework_TestCase
 		$goodEmails = array(
 			'hello@example.com',
 			'q.a@question2answer.org',
-			'example@newdomain.app'
+			'example@newdomain.app',
 		);
 		$badEmails = array(
 			'nobody@nowhere',
 			'pokémon@example.com',
 			'email @ with spaces',
 			'some random string',
+			'dotbeforeat.@email.com',
 		);
 
 		foreach ($goodEmails as $email) {