Current Perl documentation can be found at
Here is our local, out-dated (pre-5.6) version:
You should definitely use version 5. Version 4 is old, limited, and no
longer maintained; its last patch (4.036) was in 1992. The most recent
production release is 5.005_01. Further references to the Perl language in
this document refer to this production release unless otherwise specified.
There may be one or more official bug fixes for 5.005_01 by the time you
read this, and also perhaps some experimental versions on the way to the