Check the output of 

use Data::Dumper;
print Dumper \%TAGS;

[download]
$VAR1 = {
          'CONST_STR' => 1
        };

[download]

You're using the => when you don't mean to:

The => operator is a synonym for the comma, but forces any word (consisting entirely of word characters) to its left to be interpreted as a string (as of 5.001). This includes words that might otherwise be considered a constant or function call.

Solutions: 

my %TAGS = ( CONST_STR, CONST_ID );
my %TAGS = ( +CONST_STR  => CONST_ID );
my %TAGS = ( CONST_STR() => CONST_ID );
my %TAGS = ( &CONST_STR  => CONST_ID );

[download]

In reply to Re: Unable to extract value from hash table by ikegami
in thread Unable to extract value from hash table by dr_dunno

Title:
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