From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Vinicius Jose Latorre <viniciusjl@ig.com.br>
Cc: GNU Emacs <emacs-devel@gnu.org>
Subject: Re: Possible problem with looking-back function
Date: Fri, 20 Aug 2010 15:07:21 +0200 [thread overview]
Message-ID: <jwvoccxv3kj.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <4C6DE451.5080706@ig.com.br> (Vinicius Jose Latorre's message of "Thu, 19 Aug 2010 23:11:29 -0300")
> Ok, so looking-back should be replaced by:
> (progn
> (goto-char 11) ; go to end of buffer
> ;; ---- looking-back replacement --- BEGIN
> (save-excursion
> (when (/= 0 (skip-chars-backward " \t\n" 1))
> (unless (bolp)
> (forward-line 1))
> (looking-at "^\\([ \t\n]+\\)")))
> ;; ---- looking-back replacement --- END
> (match-beginning 1))
> Now it returns 1.
Or you can still use a regexp, with something like
(defun other-looking-back (re limit)
(save-restriction
(narrow-to-region (point-min) (point))
(goto-char limit)
(re-search-forward (concat "\\(?:" re "\\)\\'") nil t)))
Note that it imposes a few different constraints on the regexp, mostly
it can't use things like \> or \< or \b at the end because
narrow-to-region will prevent it from peeking at the next char.
Stefan
next prev parent reply other threads:[~2010-08-20 13:07 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-19 1:15 Possible problem with looking-back function Vinicius Jose Latorre
2010-08-19 2:43 ` Davis Herring
2010-08-19 6:09 ` Andreas Röhler
2010-08-19 8:01 ` Stefan Monnier
2010-08-19 9:02 ` Stephen J. Turnbull
2010-08-19 9:32 ` Andreas Röhler
2010-08-20 2:11 ` Vinicius Jose Latorre
2010-08-20 13:07 ` Stefan Monnier [this message]
2010-08-21 0:08 ` Vinicius Jose Latorre
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