while (<FILE>) {
   if ($state eq 'BANNER') {
      if ($_=~/END_BANNER/) {
         # found end of section, do stuff and turn off section processing
        $state='-none-';
        next;
      }
      # process a line in the banner section
   }
   elsif ($state eq 'RAS') {
      if ($_=~/END_xxxx/) {
         # found end of section, do stuff and turn off section processing
         $state='-none-';
         next;
      }
      # process a line in the ras section
   }
}