That actually would be ".*" - match anything any number of times, in regular expression speak.
That's true, and "any number of times" can also be "zero" in this case.
However, while an old standard, I don't think Regular Expressions would have been as well known or well used among computer nerds of Adams' era as the de-facto * and ? file matching patterns. Especially for nerds who were tinkerers rather than programmers.