hello all, I want to extract information from timing report using hash i done that using regexp..but dont know why one undeclare key is defined??

open (INFILE1,"timing_manual.rpt");
my %PG; 
use Data::Dumper qw(Dumper);
local $/ = "Startpoint"; $temp="abc";
while(<INFILE1>){ 

/[(](\w+)[^(]+[(](\w+)[^:]+:\s+(\w+).*?slack[^-]+(-\S+)/s; 
      
$PG{$3}{"$1-$2"}{"$cou"} = $4; 
$cou++;
}

print Dumper \%PG ;
----------------------------Output--------------------------
$VAR1 = {
          'PLBCLK1' => {
                         'rising-rising' => {
                                              '2' => '-2.47'
                                            },
                         'input-rising' => {
                                             '1' => '-1.30'
                                           }
                       },
          '' => {
                  '-' => {
                           '' => undef
                         }
                },
          'PLBCLK' => {
                        'rising-output' => {
                                             '3' => '-3'
                                           },
                        'input-output' => {
                                            '4' => '-4'
                                          }
                      }
        };
***********************************************************
         TIMING REPORT FROM WHERE I WANT EXTRACT ALL INFO.
***********************************************************
  Startpoint: PLB4ARB8M_ARB_TOP1
              (input port edge-triggered flip-flop clocked by PLBCLK1)
  Endpoint: PLB4ARB8M_ARB_TOP1/reg_PLB_WrBusControlStates_reg[9]
            (rising edge-triggered flip-flop clocked by PLBCLK1)
  Path Group: PLBCLK1
  Path Type: max

  Point                                                   Incr       P
+ath
  --------------------------------------------------------------------
+------
                                                          0.00       2
+.80 r
  library setup time                                     -1.54       1
+.26
  data required time                                                 1
+.26
  --------------------------------------------------------------------
+------
  data required time                                                 1
+.26
  data arrival time                                                 -3
+.24
  --------------------------------------------------------------------
+------
  slack (VIOLATED)                                                  -1

  Startpoint: PLB4ARB8M_ARB_TOP1/reg_PLB_pacr_reg[2]
              (rising edge-triggered flip-flop clocked by PLBCLK1)
  Endpoint: PLB4ARB8M_ARB_TOP1/reg_PLB_pesr_reg[10]
            (rising edge-triggered flip-flop clocked by PLBCLK1)
  Path Group: PLBCLK1
  Path Type: max

  Point                                                   Incr       P
+ath
  --------------------------------------------------------------------
+------
  clock PLBCLK1 (rise edge)                               0.00       0
+.00
  clock network delay (ideal)                             0.00       0
+.00
  --------------------------------------------------------------------
+------
  data required time                                                 2
+.73
  data arrival time                                                 -3
+.65
  --------------------------------------------------------------------
+------
  slack (VIOLATED)                                                  -2



  Startpoint: PLB4ARB8M_ARB_TOP1/reg_PLB_pacr_reg[2]
              (rising edge-triggered flip-flop clocked by PLBCLK1)
  Endpoint: PLB4ARB8M_ARB_TOP1
            (output port edge-triggered flip-flop clocked by PLBCLK1)
  Path Group: PLBCLK
  Path Type: max

  Point                                                   Incr       P
+ath
  --------------------------------------------------------------------
+------
  clock PLBCLK1 (rise edge)                               0.00       0
+.00

  data arrival time                                                 -3
+.24
  --------------------------------------------------------------------
+------
  slack (VIOLATED)                                                  -3


  Startpoint: CPU_DCRADDR[8]
              (input port clocked by DCRDATA)
  Endpoint: PLB_DCRDATA[9]
            (output port clocked by DCRDATA)
  Path Group: PLBCLK
  Path Type: max

  Point                                    Incr       Path
  -----------------------------------------------------------
  clock DCRDATA (rise edge)                0.00       0.00
    -----------------------------------------------------------
  data required time                                  1.14
  data arrival time                                  -1.46
  -----------------------------------------------------------
  slack (VIOLATED)                                   -4
[download]

Here i also attach a timing report from where i extract all the information..in my timing report there are thousands of paths but here i shows some of them.. What the output of my hash shows above.. but i dont want these much undefined part of my hash and why it did place into my hash???

--------------undefined key of my hash---------------
 '' => {
                  '-' => {
                           '' => undef
                         }
                },
[download]

Please help me out for these i dont what that much undefined keys or value..Thanks for your time!

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