Depends on whether your relevant criteria is "those 3 words at random" or you have some reason to draw attention to the fact that they all end in "ex".

If I saw that list, I'd certainly assume there was something special about the "ex" ending since they don't otherwise have much in common and it's extremely unlikely for random chance to produce three "-ex" words just by chance. The shorter regex does a good job of highlighting that yes, "-ex" is the relevant criteria we care about.