I consider a question about, say Apache, concerning configuration for running perl, to be on topic. Some monks may disagree, but I'll answer if I know.

I also consider an off-topic question which admits a neat answer in perl to be fine. Of course, the querent doesn't know the question's ok and neither do the rest of us until someone spots the answer.

I'm inclined to be liberal on this up to the point we get floods of lazy OT questions.

This place would be really dull if all we could talk about were perl syntax.