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Re: why auto-mode-alist's regex ends in \\'
From: |
Barry Margolin |
Subject: |
Re: why auto-mode-alist's regex ends in \\' |
Date: |
Mon, 07 Jul 2008 21:47:22 -0400 |
User-agent: |
MT-NewsWatcher/3.5.3b3 (Intel Mac OS X) |
In article <mailman.14358.1215475153.18990.help-gnu-emacs@gnu.org>,
"Lennart Borgman (gmail)" <lennart.borgman@gmail.com> wrote:
> Xah wrote:
> > By default, auto-mode-alist has a element:
> >
> > ("\\.png\\'" . image-mode)
> >
> > why is it not the following instead?
> >
> > ("\\.png$" . image-mode)
> >
> > I can't see how file name would end in a â'â, but apparently all
> > regexes there is like that. Emacs's doc node Choosing Modes doesn't
> > seems to explain this.
> >
> > Thanks.
> >
> > Xah
> > â http://xahlee.org/
>
> See
>
> (info "(elisp) Syntax of Regexps")
>
> \' matches end of string
> $ matches end of line
99.99% of the time either syntax will work in this context. It can fail
if you have filenames containing newline -- a file named
"foo.png<newline>bar" would go into image-mode if the second version
were used.
--
Barry Margolin, barmar@alum.mit.edu
Arlington, MA
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