From: Barry Margolin <barmar@alum.mit.edu>
To: help-gnu-emacs@gnu.org
Subject: Re: why auto-mode-alist's regex ends in \\'
Date: Mon, 07 Jul 2008 21:47:22 -0400 [thread overview]
Message-ID: <barmar-599C7D.21472207072008@newsgroups.comcast.net> (raw)
In-Reply-To: mailman.14358.1215475153.18990.help-gnu-emacs@gnu.org
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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 “'”, but apparently all
> > regexes there is like that. Emacs's doc node Choosing Modes doesn't
> > seems to explain this.
> >
> > Thanks.
> >
> > Xah
> > ∑ 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
*** PLEASE post questions in newsgroups, not directly to me ***
*** PLEASE don't copy me on replies, I'll read them in the group ***
next prev parent reply other threads:[~2008-07-08 1:47 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-07 23:22 why auto-mode-alist's regex ends in \\' Xah
2008-07-07 23:58 ` Lennart Borgman (gmail)
[not found] ` <mailman.14358.1215475153.18990.help-gnu-emacs@gnu.org>
2008-07-08 1:47 ` Barry Margolin [this message]
2008-07-09 0:50 ` Xah
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