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From: Stefan Monnier <monnier@iro.umontreal.ca>
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Subject: Re: Specifying a file in auto-mode-alist
Date: Fri, 23 Apr 2021 18:23:45 -0400
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>> (add-to-list 'auto-mode-alist '("^[Bb]uild.*\\.log$" . compilation-mode))
[...]
> emacs ~/workspace/src/build.log
> Nope, it shows up in Fundamental mode.

BTW, this is because of the `^` in his regexp: the regexps in
`auto-mode-alist` are matched against the full (absolute) file name, so
your regexp has to match ".../build.log" rather than just "build.log".


        Stefan