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I know that it will accept ‘*’ in file names, but standard regular expression operators such as ‘.’ or character classes do not work. I thought this would be something that I would easily find online but after about 15 min of searching, I could not find an answer to my question to my dismay.
From the Emacs manual “Visiting Files” section:
So these are not regexps; they are simple shell-style wildcards.
?matches any single character,*matches zero or more characters, and[abc]matches any of the characters a, b, or c.