Case sensitive regexp

Case sensitive regexp

[Neon Absentius]

Hello,

how can I make sure that the regular expressions are case sensitive?
By looking at the manual I thought that if the expression contains 
a capital letter then it automatically is case sensitive. However
evaluating (looking-at "A") when the point is before an "a" returns 
true.

Thanks

-- 
Charity in capitalism is like urinating to extinguish a forest fire.
    -- Neon Absentius
absent a.in.cirle sdf period lonestar period org
SDF Public Access UNIX System - http://sdf.lonestar.org

Re: Case sensitive regexp

[Pascal Bourguignon]

Neon Absentius <absent@sdf.lonestar.org> writes:

> Hello,
>
> how can I make sure that the regular expressions are case sensitive?
> By looking at the manual I thought that if the expression contains 
> a capital letter then it automatically is case sensitive. However
> evaluating (looking-at "A") when the point is before an "a" returns 
> true.

What regular expressions?

M-x apropos RET case-fold RET

--> 
isearch-toggle-case-fold
toggle-case-fold-search

default-case-fold-search


-- 
__Pascal Bourguignon__                     http://www.informatimago.com/

Nobody can fix the economy.  Nobody can be trusted with their finger
on the button.  Nobody's perfect.  VOTE FOR NOBODY.

Re: Case sensitive regexp

[Neon Absentius]

On Mon, May 23, 2005 at 04:46:19AM +0200, Pascal Bourguignon wrote:
> Neon Absentius <absent@sdf.lonestar.org> writes:
> 
> > Hello,
> >
> > how can I make sure that the regular expressions are case sensitive?
> > By looking at the manual I thought that if the expression contains 
> > a capital letter then it automatically is case sensitive. However
> > evaluating (looking-at "A") when the point is before an "a" returns 
> > true.
> 
> What regular expressions?
> 

>From the elisp manual

,----
|- Function: looking-at regexp                                                                       
|    This function determines whether the text in the current buffer                                 
|    directly following point matches the regular expression REGEXP.                                 
`----

So, since the regular expression "A" matches only the string "A" I
assumed that (looking-at "A") would return true only if the character
following point was "A".

> M-x apropos RET case-fold RET
> 
> --> 
> isearch-toggle-case-fold
> toggle-case-fold-search
> 
> default-case-fold-search
> 

Thanks. That did it.

-- 
Charity in capitalism is like urinating to extinguish a forest fire.
    -- Neon Absentius
absent a.in.cirle sdf period lonestar period org
SDF Public Access UNIX System - http://sdf.lonestar.org

Re: Case sensitive regexp

[Kevin Rodgers]

Neon Absentius wrote:
> how can I make sure that the regular expressions are case sensitive?
> By looking at the manual I thought that if the expression contains 
> a capital letter then it automatically is case sensitive.

I think that is true when the regexp is entered interactively, e.g.
with C-s.

> However
> evaluating (looking-at "A") when the point is before an "a" returns 
> true.

Try (let ((case-fold-search nil)) (looking-at "A"))

-- 
Kevin Rodgers