perl - Make hash from regex expression patten match -error -

i making hash regex expression. run program below , have check @ end see if hash made ok. keep getting error value., array(0x1a1c740), when should 437768. keys can display ok. didnt split because need key first part of species name. matching.

# "aaaaaaaaaa","aaaaaaaaaa","437768","cryptophyta sp. cr-mal06",0 

thanks may give.

use strict; use warnings;  open (my $in_fh,"$argv[0]") or die "failed open file: $!\n"; open (my $out_fh, ">genus.txt");  %hash; while ( $line = <$in_fh> ) {      #      # "aaaaaaaaaa","aaaaaaaaaa","437768","cryptophyta sp. cr-mal06",0      #      if ($line =~ m/\"+\w+\"+\,+\"+\w+\"+\,+\"+(\d+)\"+\,+\"+(\w+)+.+/) {          $v = $1;          $k = $2;           $hash{$k} = [$v];      } }  if (exists $hash{'cryptophyta'}) {     print $out_fh $hash{'cryptophyta'}; } else {     print $out_fh "no\n"; }  close $in_fh; close $out_fh;   

change line:

$hash{$k} = [$v]; 

to

$hash{$k} = $v; 

[$v] reference array want store scalar.