在Emacs中接受c-x c-f（打开文件）的正则表达式是什么？

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.I know that it will accept '*' in file names, b