note muba <p>First of all, what do you mean by <i>null</i>? I will assume you mean [doc://undef], but you might as well mean the numerical value 0.</p> <p>Secondly, one of Perl's slogan's is <i>There Is More Than One Way To Do It</i>, or TIMTOWTDI as we say. This applies here as well. There is no <i>the correct way</i>, there are many.</p> <p>My next question, thus, is: what have you tried? Why didn't it work? Did you get any error messages and if you did, which? How did your output not meet your expectations?</p> <p>Lastly, a regular expression in the traditional sense ([doc://m|m//]) might not b the most suitable task. What you have is a <c>|</c> delimited string, so most likely you'll want to [doc://split] on that. Keep in mind that <c>split</c> takes a regular expression as its first argument, and <c>|</c> has a special meaning inside regular expression so you'll have to escape that.</p> <p>Then you'll want to iterate over the list you get, using something like [doc://map] for example, or if you're uncomfortable with those merits of functional programming, you could do it with a simple [http://perldoc.perl.org/perlsyn.html#Foreach-Loops|foreach] loop over the array.</p> <p>This should give you the building blocks you're looking for.</p> 1005032 1005032