#!/usr/bin/perl -w

use strict;

my %index = ( 
	'node'			=> 1,
	'node-cat'		=> 2,
	'node-cat-cat'		=> 3,
	'node-cat-cat-cat'	=> 4,
	'node-bat-bat-cat'	=> 4,
	'node-cat-cat-cat-cat'	=> 5,
	'node-cat-bat-bat-bat'	=> 5,
	'node-cat-cat-bat-bat'	=> 2,
);

my $key;
my $test='node-cat-cat';

foreach $key (sort keys %index) {
	print "$key: $index{$key}\n";
}

#
# DELETE all child nodes.
#
print "\nDelete children of $test :\n";
foreach $key (%index){
#foreach $key (sort keys %index){
#while ($key = each %index) {
  	delete $index{$key} if ($key =~ /$test.+/);
}

print "\nFinal Hash:\n";
foreach $key (sort keys %index) {
	print "$key: $index{$key}\n";
}