The correct answer depends on you. Things to consider:
- Does it work correctly?
- Do you understand it?
- Would anyone else understand it?
- Will you understand it in a month's time?
- Does it strike a good balance between terseness and verbosity?
- Could you make changes to it without it being likely to break in unforeseen ways?
- and a very distant last: Is it fast enough?
If you can answer yes to all those questions you can consider the code to be correct.
Perl is environmentally friendly - it saves trees