What about this?

sub andify {
  return '' unless @_;
  return $_[0] if @_ == 1;
  local $" = @_ == 2 ? ' ' : ', ';
  $_[-1] = 'and ' . $_[-1];
  return "@_";
}

[download]
Fixed squiggly brackets and should be $" not $,.
Fixed comma placement.
Got rid of blackberry comment.
Handled null case.
Changed regex to concatenation
Harley J Pig

20050525 Edit by ysth: p, code tags

In reply to what about using $" ? by harleypig
in thread Format a list with commas and "and" by merlyn

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
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