For that, you might as well just use the regex functionality in man itself too. But that misses the point. The goal of grepping in that snippet is that you're

For that, you might as well just use the regex functionality in man itself too. But that misses the point. The goal of grepping in that snippet is that you're `less `ing through precisely the parts that matter, and no more, rather than wading through the whole man page, and you're using -C to control how much context you (think you) need around the search results. This is a much better setup for skimming through potential hits than going through the man page wall of text.