[BUGFIX] Form email validation is case sensitive

Currently the FORM email validation is using a regular expression which
checks the email address. This check also inclused case sensitivity.

This patch fixes this by using the email address validator which comes
with the extension core.

Change-Id: Ib1449198f66f023a01c9791e74eb2d634abd77df
Resolves: #43924
Releases: 6.0, 6.1, 6.2
Reviewed-on: https://review.typo3.org/20421
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters

typo3/sysext/form/Classes/Validation/EmailValidator.php

@@ -40,7 +40,7 @@ class EmailValidator extends \TYPO3\CMS\Form\Validation\AbstractValidator {
 	public function isValid() {
 		if ($this->requestHandler->has($this->fieldName)) {
 			$value = $this->requestHandler->getByMethod($this->fieldName);
-			if (!preg_match('/^(?:(?#local-part)(?#quoted)"[^\\"]*"|(?#non-quoted)[a-z0-9&+_-](?:\\.?[a-z0-9&+_-]+)*)@(?:(?#domain)(?#domain-name)[a-z0-9](?:[a-z0-9-]*[a-z0-9])*(?:\\.[a-z0-9](?:[a-z0-9-]*[a-z0-9])*)*|(?#ip)(\\[)?(?:[01]?\\d?\\d|2[0-4]\\d|25[0-5])(?:\\.(?:[01]?\\d?\\d|2[0-4]\\d|25[0-5])){3}(?(1)\\]|))$/', $value)) {
+			if (!\TYPO3\CMS\Core\Utility\GeneralUtility::validEmail($value)) {
 				return FALSE;
 			}
 		}

typo3/sysext/form/Tests/Unit/Validation/EmailValidatorTest.php

@@ -25,11 +25,12 @@ namespace TYPO3\CMS\Form\Tests\Unit\Validation;
 ***************************************************************/
 
 /**
- * Test case for class \TYPO3\CMS\Form\Validation\EmailValidator.
+ * Test case
  *
  * @author Andreas Lappe <a.lappe@kuehlhaus.com>
  */
 class EmailValidatorTest extends \TYPO3\CMS\Extbase\Tests\Unit\BaseTestCase {
+
 	/**
 	 * @var \TYPO3\CMS\Form\Tests\Unit\Validation\Helper
 	 */
@@ -51,16 +52,16 @@ class EmailValidatorTest extends \TYPO3\CMS\Extbase\Tests\Unit\BaseTestCase {
 
 	public function validEmailProvider() {
 		return array(
-			'a@b.de'               => array('a@b.de'),
-			'somebody@localhost'   => array('somebody@localhost'),
+			'a@b.de' => array('a@b.de'),
 			'somebody@mymac.local' => array('somebody@mymac.local')
 		);
 	}
 
 	public function invalidEmailProvider() {
 		return array(
-			'myemail@'           => array('myemail@'),
-			'myemail'            => array('myemail'),
+			'myemail@' => array('myemail@'),
+			'myemail' => array('myemail'),
+			'somebody@localhost' => array('somebody@localhost'),
 		);
 	}