Hello Perl Monks!

I have a program to count 0's in a long string of characters but only in the substrings specified within the foreach loop. Right now I am just counting the 0's in each substring discretely but would like to print the sum of all the 0's from all the substrings. Is there a elegant, quick way to do this without a looping variable?" Many Thanks! 

my $input_dir = "/Users/logancurtis-whitchurch/Desktop/IB_Senior_Thesi
+s/consensus_files/mask_files/"; #directory with mask files
my $input_file = "$input_dir"."mask."."$population".".txt";    
open(CGS, "<$input_file") or die "can't open input_file\n";
my $cgs = <CGS>;

my $interval = "/Users/logancurtis-whitchurch/Desktop/chrX_divisions/"
+."$region"."_$filter".".txt"; #specifiecs intervals by region and fil
+ter version
open (INTERVAL, "<$interval") or die "can't open interval file\n";
foreach ( <INTERVAL> ) {
    
    my (undef, $start, $end) = split '\s+', $_;
    my $subs_length = $end-$start;
    my $included_length = substr( $cgs, $start, $subs_length );  
        
    print length $included_length;

    printf "found %d zeros\n", $included_length =~ tr[0][];
}

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In reply to Summing Variables in foreach loop by ccelt09

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