my (%foos, %bars);
while( my $line = <DATA> ) {
  chomp $line;
  if ( line =~ /^foo (?<KEY>[^:]*):(?<VAL>[^:]*)$/ ) {
    push( @{ $foos{ $+{KEY} } }, $+{VAL} );
  } elsif ( $line =~ /^bar (?<KEY>[^:]*):(?<VAL>[^:]*)$/ ) {
    push( @{ $bars{ $+{KEY} } }, $+{VAL} );
  } else {
#    warn qq( "$line" is the wrong format.\n );
  }
}