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From: Stefan Monnier <monnier@iro.umontreal.ca>
Newsgroups: gmane.emacs.help
Subject: Re: Setting file extensions to be handled by gpg encryption problem
Date: Thu, 04 Nov 2010 15:42:07 -0400
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> (custom-set-variables
> '(epa-file-name-regexp "\(\\.txt$\)\|\(\\.gpg$\)")
> )

You want something like:

   (custom-set-variables
   '(epa-file-name-regexp "\\.\\(txt\\|gpg\\)\\'"))
or
   (custom-set-variables
   '(epa-file-name-regexp "\\.txt\\'\\|\\.gpg\\'"))

In a string (i.e. with the "...") a \( is just the same as a (, so it's
important to double your backslashes in order for them to be visible to
the regexp engine.

Note how I used \' (match the end of text) rather than $ (match the end
of line).


        Stefan