use strict;
use warnings;
use Data::Dumper;

my %all_entry;

while (<DATA>) {    
        chomp;           
        next unless (/^>/);       
        my $line = $_;   

	while ($line =~ /GI\=(\d+)\,(\w+)\,(\d+\-\d+)/g){		
					
	push @{ $all_entry{$1}{$2} }, $3;
					
	}
        
        

    }

print Dumper \%all_entry;

output:
-------

$VAR1 = {
          '162960844' => {
                           'bw' => [
                                     '0-4',
                                     '9025576-9025608'
                                   ]
                         },
          '152989753' => {
                           'bw' => [
                                     '0-30',
                                     '1877925-1877931'
                                   ]
                         }
        };