docs: public void checkEmail(String email) throws CmsIllegalArgumentException {
  
          if (CmsStringUtil.isNotEmpty(email)) {
              email = email.trim();
              email = email.toLowerCase(Locale.ROOT);
          }
          if (!CmsStringUtil.validateRegex(email, EMAIL_REGEX, false)) {
              throw new CmsIllegalArgumentException(Messages.get().container(Messages.ERR_EMAIL_VALIDATION_1, email));
          }
      }