Get variables from QUERY_STRING

if ( $ENV { 'REQUEST_METHOD' } eq "GET" ) {
  $qstring = $ENV { 'QUERY_STRING' } ;
} else {
  $qstring = < STDIN > ;                    # read(STDIN, $qstring, $ENV{'CONTENT_LENGTH'});
}

@pairs = split (/&/, $qstring );                 # split the name-value pairs
foreach $pair ( @pairs )                         # loop through each pair
{
   ( $name , $value ) = split (/=/, $pair );       # Create a Name/Value pair set
    $name = ~ tr /a-z/A-Z/;                      # make keys uppercase (optional)
    $value = ~ s /\+/ / g;                        # change + signs to spaces
    $value = ~ tr /+/ / ;                         # change + signs to spaces (alternate)
    $value = ~ s /%(..)/pack("c",hex($1))/ ge ;    # convert the URI code
    $in { $name } = $value ;                       # put in hash array %in
}

print %in