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From: "Andreas Röhler" <andreas.roehler@online.de>
To: emacs-devel@gnu.org
Cc: Jon Dufresne <jon.dufresne@gmail.com>
Subject: Re: c-mode syntax strings and regexp word boundaries
Date: Fri, 06 Sep 2013 14:21:07 +0200	[thread overview]
Message-ID: <5229C8B3.5060800@online.de> (raw)
In-Reply-To: <CADhq2b5kSexzU4ec-qcjFpEPLcRO96=eKvqYyQH3wmkp1BhgvA@mail.gmail.com>

Am 06.09.2013 07:14, schrieb Jon Dufresne:
> Hi,
>
> I am trying to modify a major mode derived from c-mode. I am adding support
> for an alternative string syntax (PHP heredoc). To do this I am using
> "syntax-propertize-function" and
> "syntax-propertize-extend-region-functions". (As an aside I am not sure
> this is the best approach, but it is best I have come up with so far.)
>
> When trying to extend the propertize region, a regexp fails, but I am not
> clear as to why. I have isolated the problem with the following test case.
>
> ---
> (with-temp-buffer
>    (c-mode)
>    (insert "END;\n")
>    (goto-char (point-min))
>    (message "Search forward first time")
>    (re-search-forward "^END\\b")
>    (put-text-property (1- (point)) (point)
>                       'syntax-table (string-to-syntax "|"))
>    (goto-char (point-min))
>    (message "Search forward second time")
>    (re-search-forward "^END\\b"))
> ---
>
> Running this give me the output:
>
> Search forward first time
> Search forward second time
> Search failed: "^END\\b"
>
> I do not understand why the second regexp fails. I suppose it has to do
> with the text property string boundary. What is the correct way to look for
> the boundary in this case?
>
> Thanks for any help.
>

For me it's strange too.

Second

(re-search-forward "^END\\s.")

matches that way.

Can't see why the word-boundary isn't recognised any more.

Andreas



  reply	other threads:[~2013-09-06 12:21 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-09-06  5:14 c-mode syntax strings and regexp word boundaries Jon Dufresne
2013-09-06 12:21 ` Andreas Röhler [this message]
2013-09-06 14:07 ` Stefan Monnier
2013-09-06 14:55   ` Jon Dufresne
2013-09-06 15:44     ` Stefan Monnier
2013-09-06 17:04       ` Jon Dufresne
2013-09-06 20:19 ` Alan Mackenzie
2013-09-06 22:38   ` Jon Dufresne
2013-09-11  8:57   ` Andreas Röhler

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