what means "\\s-" used as a regexp?

what means "\\s-" used as a regexp?

[stefano.sabatini-lala]

Hello everybody.

I recently found in some code the use of "\\s-". Documentation
appearantly said nothing on it.

(string-match "\\s-" "hello world")
==>5

(string-match "\\s-" "hello\\tworld")
==>nil

(string-match "\\s-" "hello\\nworld")
==>nil

So it seems "\\s-" match only the space.
But I still doesn't understand the  meaning of the hypen at the end of
the
regexp "\\s-".

(string-match "\\s" "hello world")
returns the error: (invalid-regexp "Premature end of regular
expression")

Thank you. 
--stefano

Re: what means "\\s-" used as a regexp?

[Ralf Angeli]

* stefano sabatini-lala (2006-08-05) writes:

> I recently found in some code the use of "\\s-". Documentation
> appearantly said nothing on it.

(info "(elisp)Regexp Backslash")

-- 
Ralf

Re: what means "\\s-" used as a regexp?

[Michaël Cadilhac]

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stefano.sabatini-lala@poste.it writes:

> Hello everybody.
>
> I recently found in some code the use of "\\s-". Documentation
> appearantly said nothing on it.
>
> (string-match "\\s-" "hello world")
> ==>5
>
> (string-match "\\s-" "hello\\tworld")
> ==>nil
>
> (string-match "\\s-" "hello\\nworld")
> ==>nil
>
> So it seems "\\s-" match only the space.
> But I still doesn't understand the  meaning of the hypen at the end of
> the
> regexp "\\s-".
>
> (string-match "\\s" "hello world")
> returns the error: (invalid-regexp "Premature end of regular
> expression")

,----[ (info "(Elisp)Regexp Backslash") ]
| `\sCODE'
|      matches any character whose syntax is CODE.  Here CODE is a
|      character that represents a syntax code: thus, `w' for word
|      constituent, `-' for whitespace, `(' for open parenthesis, etc.
|      To represent whitespace syntax, use either `-' or a space
|      character.  *Note Syntax Class Table::, for a list of syntax codes
|      and the characters that stand for them.
`----


-- 
 |      Michaël `Micha' Cadilhac   |  Would someone please DTRT with this,  |
 |         Epita/LRDE Promo 2007   |        then ACK?                       |
 | http://www.lrde.org/~cadilh_m   |          -- Richard Stallman           |
 `--  -   JID: micha@amessage.be --'                                   -  --'

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Re: what means "\\s-" used as a regexp?

[Eli Zaretskii]

> From: stefano.sabatini-lala@poste.it
> Date: 5 Aug 2006 04:38:51 -0700
> 
> I recently found in some code the use of "\\s-". Documentation
> appearantly said nothing on it.

It does on my system:

    `\sC'
	 matches any character whose syntax is C.  Here C is a character
	 that designates a particular syntax class: thus, `w' for word
	 constituent, `-' or ` ' for whitespace, `.' for ordinary
	 punctuation, etc.  *Note Syntax::.

> So it seems "\\s-" match only the space.

Yes.

Re: what means "\\s-" used as a regexp?

[stefano.sabatini-lala]

Eli Zaretskii ha scritto:

> > From: stefano.sabatini-lala@poste.it
> > Date: 5 Aug 2006 04:38:51 -0700
> >
> > I recently found in some code the use of "\\s-". Documentation
> > appearantly said nothing on it.
>
> It does on my system:
>
>     `\sC'
> 	 matches any character whose syntax is C.  Here C is a character
> 	 that designates a particular syntax class: thus, `w' for word
> 	 constituent, `-' or ` ' for whitespace, `.' for ordinary
> 	 punctuation, etc.  *Note Syntax::.

Thank you all!

My *info* buffer was opened on that very page, but for some mysterious
reasons I missed that explanation...