A more general approach with "nested" iterators:
sub read_chunk {
my ($fh,$mod) = @_;
my $chunk;
while ( <$fh> ) {
$chunk .= $_;
return $chunk unless $. % $mod;
}
return $chunk;
}
open my $fh, "<", \$string;
while ( my $chunk = read_chunk( $fh, 14 ) ) {
print $chunk;
print "-"x5,"\n";
}
works with anything you can open via filehandle even strings.
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