newline doesn't have whitespace syntax?

newline doesn't have whitespace syntax?

[John Conrad]

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When I read this in the elisp manual:

"Space, tab, newline and formfeed are classified as whitespace in almost all
major modes."
(35.2.1 Table of Syntax Classes)

I assumed that this re-search-forward expression would match the line
following it, but no dice.

(re-search-forward "abcd[[:space:]]")
abcd

I've tried several different modes, including fundamental mode. Am I missing
something?

Using Emacs 22.0.50.1

John Emerson Conrad

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Re: newline doesn't have whitespace syntax?

[David Hansen]

On Fri, 12 May 2006 10:22:37 -0400 John Conrad wrote:

> When I read this in the elisp manual:
>
> "Space, tab, newline and formfeed are classified as whitespace in
> almost all major modes."
> (35.2.1 Table of Syntax Classes)
>  
> I assumed that this re-search-forward expression would match the line
> following it, but no dice.
>
> (re-search-forward "abcd[[:space:]]")
> abcd
>
> I've tried several different modes, including fundamental mode. Am I
> missing something?

Sounds like an Emacs bug to me "\\s " is working (in
fundamental-mode).  Anyway newline isn't whitespace in
"most" modes.  In quite a lot of languages a newline ends a
comment.  To make your regexp reliable i would use something
like "abcd\\(\\s \\|$\\)" (note that this will match "abcd"
at the end of the buffer too w/o a final newline).

BTW:  M-: (syntax-after (point)) RET may be useful.

David

Re: newline doesn't have whitespace syntax?

[Kevin Rodgers]

David Hansen wrote:
> On Fri, 12 May 2006 10:22:37 -0400 John Conrad wrote:
> 
>> When I read this in the elisp manual:
>>
>> "Space, tab, newline and formfeed are classified as whitespace in
>> almost all major modes."
>> (35.2.1 Table of Syntax Classes)
>>  
>> I assumed that this re-search-forward expression would match the line
>> following it, but no dice.
>>
>> (re-search-forward "abcd[[:space:]]")
>> abcd
>>
>> I've tried several different modes, including fundamental mode. Am I
>> missing something?
> 
> Sounds like an Emacs bug to me "\\s " is working (in
> fundamental-mode).  Anyway newline isn't whitespace in
> "most" modes.  In quite a lot of languages a newline ends a
> comment.

Right!  But in Fundamental and Text modes, newline should have
whitespace syntax (unless there is a syntax-table text property
on it that specifies some other class).

> To make your regexp reliable i would use something
> like "abcd\\(\\s \\|$\\)" (note that this will match "abcd"
> at the end of the buffer too w/o a final newline).

"abcd\\>" or "abcd\\b" might be closer to what John wants,
although the trailing whitespace (if any) would not be included
in the match.

> BTW:  M-: (syntax-after (point)) RET may be useful.

C-u C-x =

-- 
Kevin