if (cond) {
   ...stuff...
}
else {
   #nothing here
   if (cond2) {
      ...more stuff...
   }
   #nothing here, either
}

##</code><code>##

if (cond1) {
   ...stuff...
}
elsif (cond2) {
   ...more stuff...
}


##</code><code>##

while (<FILE>) {
   if ($ban_gate==1) {
      if ($_=~/END_BANNER/) {
         # found end of section, do stuff and turn off section processing
         $ban_gate=0;
      }
      else {
         # process a line in the banner section
      }
   }
   else {
      if ($ras_gate==1) {
         if ($_=~/END_xxxx/) {
            # found end of section, do stuff and turn off section processing
            $ras_gate=0;
         }
      }
      else {
         # process a line in the ras section
      }
   }
}

##</code><code>##

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
   }
}