public static function validateCode($courseCode)
{
$courseCode = trim($courseCode);
if (!preg_match("/^[A-Z0-9]{1,10}\$/", $courseCode)) {
throw new Exception("Course code can contain capital letters in the range of A-Z, numbers 0-9 and of length 1-10.");
}
if (CourseFetcher::codeExists($courseCode)) {
throw new Exception("Course code already exists on database. Please insert a different one.");
}
return $courseCode;
}
