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my $string = "1234,Dr,Huxtable,Cliff,M,24/12/1976,60";
my $last_two_chars = substr($string, -2, 2);
print $last_two_chars . "\n";

my $temp_col_id = 0;
my %COLUMN_IDS_BY_NAME = map {$_, $temp_col_id++} qw(num1 title surnam
+e firstname sex dob num2);
...
print $split_data[$COLUMN_IDS_BY_NAME{title}] . "\n";
print $split_data[$COLUMN_IDS_BY_NAME{firstname}] . "\n";
# etc...