Regular expressions and glob(7) expressions look superficially similar, but it is mostly an illusion; they both use * and ? as common metacharacters, but both of those characters mean different things in the two systems. Only the [ and ] characters are used more similarly, but even those have their differences. The two syntaxes only have one common function which functions identically in the two systems, but it is invoked by different characters; specifically the ? (question mark) character in glob(7) exactly corresponds to the . (full stop) character in regular expressions.