Here is my solution:
use strict;
use warnings;
my $string = "CTCCGGATCTAT";
my $sets = length($string)/3; # we want to know how man
+y sets of 3 there are
my $unpacker = 'A3' x $sets; # create our unpack templ
+ate
my @dna = unpack($unpacker, $string); # create the array of set
+s
my $counter = 0; # initialize the counter
for my $set (@dna) { # for each $set in @dna d
+o...
my $check = substr($set, 2, 1); # get the 3rd char of the
+ $set
++$counter if ($check =~ /[GC]/i); # increment the counter,
+ignore case
}
print "$counter/$sets was either C or G.\n"; # print results
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