open (FILE '<filename');
$_ = join('',<FILE>);
close (<FILE>);
my ($result) = m!$match(?:.*?$/){$Nth}(.*?$/)!s;
print $result;

##</code><code>##

open (FILE '<filename');
$_ = join('',<FILE>);
while ( m!$match(?:.*?$/){$Nth}(.*?$/)!sg) {
  print $1;
#  pos = length ($match) + length ($`);
}