TYPO3 Core

after line 57 in the setPrefix function in /sysext/form/Classes/Request.php:

the prefix is not allowed to contain square brackets. but this would be useful if the form requires a more complex variable organisation. they should be added to the regex of the allowed characters. i belive like so:

$this->prefix = preg_replace('/[^a-zA-Z0-9_\\-\\[\\]]/', '', $prefix);