package global_constants;

use strict;
use warnings;

my %constants;
BEGIN {
   %constants = (
      LOAD_ARABIC       => 1,
      LOG_USERS_ACTIONS => 1,
      ENABLE_RCSE       => 1,
   );
}

use constant \%constants;

use base 'Exporter';

our @EXPORT      = ();
our @EXPORT_OK   = keys(%constants);
our %EXPORT_TAGS = (
   all     => \@EXPORT_OK,
   default => \@EXPORT,
   log     => [ grep /^LOG_/, @EXPORT_OK ], # all constants beginning 
+with "LOG_"
);

1;
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And then in a module that uses it:

use global_constants qw( :all );
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Another module that only needs to import the LOG_* constants, and one other one:

use global_constants qw( :log ENABLE_RCSE );
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