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From: Stefan Monnier <monnier@iro.umontreal.ca>
Newsgroups: gmane.emacs.help
Subject: Re: systemd @ in filenames not supported by thing-at-point
Date: Sat, 30 Jul 2016 13:29:53 -0400
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>> (defvar thing-at-point-file-name-chars "-~/[:alnum:]_.${}#%,:"
[...]
>> (setq thing-at-point-file-name-chars "@-~/[:alnum:]_.${}#%,:")

"@-~" matches all chars between @ and ~.
IOW it's important to keep the "-" as the first character.


        Stefan