#
# Counting Program in Perl
#
use strict; use warnings;

sub countnmstr {
    my ($haystack, $needle) = @_;
    my $adj = length($needle) - 1;
    die "Search string cannot be empty!" if $adj < 0;

    my $count = 0;
    while ( $haystack =~ /\Q$needle/g ) {
        pos $haystack -= $adj;
        $count += 1;
    }
    return $count;
}

print countnmstr("TATATATATATA","TATA"), "\n";