I tried the code below but it still keeps giving me the same error (Use of uninitialized value in print). I am sorry, I am new to Perl, so I might be missing something in your earlier reply. 
    use constant CONST_STR => "MYSTRING";
    use constant CONST_ID  => 1;

    my %TAGS = ( CONST_STR, CONST_ID );

    my $fullString = "123456 MYSTRING 123456";
    my $string;

    ($string) = $fullString =~ /[A-Za-z]*/;

    print $TAGS{$string};

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In reply to Re^2: Unable to extract value from hash table by dr_dunno
in thread Unable to extract value from hash table by dr_dunno

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