* Re: a question about regular expression
[not found] <83ske8zwkz.fsf@ymail.invalid>
@ 2009-09-28 9:54 ` Bruno Barbier
2009-09-30 12:43 ` tomas
0 siblings, 1 reply; 2+ messages in thread
From: Bruno Barbier @ 2009-09-28 9:54 UTC (permalink / raw
To: help-gnu-emacs
On 2009-09-27, Water Lin <WaterLin@ymail.invalid> wrote:
>
> Here is my code:
> ---------------
> (defun copy-word (&optional arg)
> "Copy words at point"
> (interactive "P")
> (let ((beg (progn (if (looking-back "[_a-zA-Z0-9]" 1)
> (backward-word 1)) (point)))
> (end (progn (forward-word arg) (point))))
> (copy-region-as-kill beg end))
> )
> ---------------
>
> I want use M-x copy-word to copy a word even the word is combined by _
> . But I don't know why my regular expression doesn't work.
>
> Not every familiar with elisp, sorry for this stupid question.
>
I use:
M-x re-builder
to build interactively my regular expressions and see what they match.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: a question about regular expression
2009-09-28 9:54 ` a question about regular expression Bruno Barbier
@ 2009-09-30 12:43 ` tomas
0 siblings, 0 replies; 2+ messages in thread
From: tomas @ 2009-09-30 12:43 UTC (permalink / raw
To: Bruno Barbier; +Cc: help-gnu-emacs
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On Mon, Sep 28, 2009 at 09:54:29AM +0000, Bruno Barbier wrote:
> On 2009-09-27, Water Lin <WaterLin@ymail.invalid> wrote:
> >
> > Here is my code:
> > ---------------
> > (defun copy-word (&optional arg)
> > "Copy words at point"
> > (interactive "P")
> > (let ((beg (progn (if (looking-back "[_a-zA-Z0-9]" 1)
> > (backward-word 1)) (point)))
> > (end (progn (forward-word arg) (point))))
> > (copy-region-as-kill beg end))
> > )
> > ---------------
> >
> > I want use M-x copy-word to copy a word even the word is combined by _
> > . But I don't know why my regular expression doesn't work.
I think the regexp is working fine (but my notion of "works" might
differ from yours). At least, for me, (looking-back...) yields t when
point is not at the beginning of the word (like so: " e^nter") and f when
at the beginning (say: " ^enter"). One weakness might be when the word
is preceded by several non-word chars (like "^ enter"). Then all of
those will be included in your copy.
Besides, forward_word has a different idea about what a word is. It will
stop at the first "_", giving you a short copy.
Regards
- -- tomás
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2009-09-28 9:54 ` a question about regular expression Bruno Barbier
2009-09-30 12:43 ` tomas
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