Using Storable:

use Storable;

store(\@array, 'file.ext');

my $aref = retrieve('file.ext');
[download]

JSON is also a good choice, and it's cross language/platform. ie. I can get the data from the file in Python after writing it in Perl:

use warnings;
use strict;

use JSON;

my @array = qw(1 2 3);

open my $wfh, '>', 'file.ext'
  or die "can't open file for writing: $!";

print $wfh encode_json(\@array);

close $wfh;

open my $fh, '<', 'file.ext'
  or die "can't open file for reading: $!";

my $aref = decode_json(<$fh>);

close $fh;
[download]

Thanks Stevieb for the response .. and everyone else .. But somehow it does not work .. or may be i am not doing it right If i print the reg_map variable using the following code

for $i ( 0 .. $page_counter-1 ) {
  print " ###### HI $i #### \n";
  eval ( "\$Total_Size = \$\#reg_map${i}");
  print " Total Size = $Total_Size\n";
  for $j1 ( 0 .. $Total_Size ) { 
    eval ("\$Num_elements_in_row  = \@\{\$reg_map${i}\[\$j1\]\}");
    print " Num_elements_in_row $j1 is = $Num_elements_in_row\n";
    for $j3 ( 0 .. $Num_elements_in_row ) {
     eval("print \"Bit 1 :\$i:\$j1:\$j3 is  \$reg_map${i}\[\$j1\]\[\$j
+3\]\n\"");
    }
  }
}
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I get the following display

Total Size = 80

Num_elements_in_row 0 is = 3

Bit 1 :0:0:0 is NONE

Bit 1 :0:0:1 is NONE

Bit 1 :0:0:2 is NONE

Bit 1 :0:0:3 is

Num_elements_in_row 1 is = 4

Bit 1 :0:1:0 is TEMP

Bit 1 :0:1:1 is 0

Bit 1 :0:1:2 is .

Bit 1 :0:1:3 is 1

Bit 1 :0:1:4 is

I used Store as follows

 store(\@reg_map, 'file.ext');my $aref = retrieve('file.ext');

When i print aref using the code below

 
for $i ( 0 .. $page_counter-1 ) {
  print " ###### HI $i #### \n";
  eval ( "\$Total_Size = \$\#aref${i}");
  print " Total Size = $Total_Size\n";
  for $j1 ( 0 .. $Total_Size ) { 
    eval ("\$Num_elements_in_row = \@\{\$aref${i}\[\$j1\]\}");
    print " Num_elements_in_row $j1 is = $Num_elements_in_row\n";
    for $j3 ( 0 .. $Num_elements_in_row ) {
     eval("print \"Bit 2 :\$i:\$j1:\$j3 is  \$aref${i}\[\$j1\]\[\$j3\]
+\n\"");
    }
  }
}
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I get the following

###### HI 0 ####

Total Size = -1

###### HI 1 ####

Total Size = -1

I Also tried using JSON as follows

 
open my $wfh, '>', 'file1.ext'
  or die "can't open file for writing: $!";

print $wfh encode_json(\@reg_map);

close $wfh;

open my $fh, '<', 'file.ext'
  or die "can't open file for reading: $!";

my @aref = decode_json(<$fh>);
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But i get an error at the last line :

malformed JSON string, neither array, object, number, string or atom, at character offset 0 (before "pst0\x{4}\x{8}\x{8}1...") at perl_script.pl line 100, <$fh> line 1.

Any thoughts on this ..

 eval "..."

now is a good time to stop writing code like that :)

the array is populated in the following manner

   eval(" push \@reg_map${page_counter},\[\"\$var01\",\$var00,\"$var02
+\"\]");
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Eek. So you have something like @reg_map00,@reg_map01,@reg_map02,..?

• Instead of @reg_map00,@reg_map01,@reg_map02 use @reg_map - $reg_map[0], $reg_map[1], $reg_map[2]. If you want to store arrays in those slots, use anonymous arrays.
• Instead of $var01,$var00,$var02 use @var - $var[1], $var[0], $var[2]

push @{$reg[$page_counter]}, @var;
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Think of eval as a costly subshell under the control of you program in its own sandbox¹. Setting that up only to push to an array is overkill, convoluted, difficult to read and maintain.

Whenever you are tempted to use variables using a stem and a suffix, e.g. $some_foo, $some_bar, $some_baz - use a hash instead:

%some = (
    foo => ...,
    bar => ...,
    baz => ...,
    ...
);
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This makes your code cleaner, more readable, more maintainable, and it makes constructs like your eval push unnecessary.

¹) Not quite a sandbox proper, since even string eval gets the surrounding lexicals, let alone (package) globals.