regular expression for hiding comment

regular expression for hiding comment

[tomer]

i use a language which mark comment with "--".
is want to all lines in all buffer ( grep-buffer regular expression)
that are not comment.
Is it possible ?
Thanks
Tomer

Re: regular expression for hiding comment

[Peter Dyballa]

Am 07.05.2009 um 08:44 schrieb tomer:

> Is it possible ?


Yes. ^.*[^-][^-].*$

--
Greetings

   Pete

Who the fsck is "General Failure," and why is he reading my disk?

Re: regular expression for hiding comment

[tomer]

On May 7, 11:20 am, Peter Dyballa <Peter_Dyba...@Web.DE> wrote:
> Am 07.05.2009 um 08:44 schrieb tomer:
>
> > Is it possible ?
>
> Yes. ^.*[^-][^-].*$
>
> --
> Greetings
>
>    Pete
>
> Who the fsck is "General Failure," and why is he reading my disk?

I think it is not working

Re: regular expression for hiding comment

[Pascal J. Bourguignon]

tomer <tomer1levin@walla.co.il> writes:

> On May 7, 11:20 am, Peter Dyballa <Peter_Dyba...@Web.DE> wrote:
>> Am 07.05.2009 um 08:44 schrieb tomer:
>>
>> > Is it possible ?
>>
>> Yes. ^.*[^-][^-].*$
>>
>> --
>> Greetings
>>
>>    Pete
>>
>> Who the fsck is "General Failure," and why is he reading my disk?
>
> I think it is not working

The problem is that you didn't say what you wanted to do.  
With computers, anything is possible, if you have infinite memory and
infinite time.

Now you're saying that it is not working.  But you don't tell us what
is not working, what you did, what you expected and what you got?
Do people have telepathic powers in your country?


Of your original post:

> i use a language which mark comment with "--".
> is want to all lines in all buffer ( grep-buffer regular expression)
> that are not comment.
> Is it possible ?
> Thanks
> Tomer

Only the sentence "Is it possible?" is gramatically correct, and can
be parsed to something meaningful, if lacking a context.


-- 
__Pascal Bourguignon__

Re: regular expression for hiding comment

[tomer]

On May 7, 3:07 pm, p...@informatimago.com (Pascal J. Bourguignon)
wrote:
> tomer <tomer1le...@walla.co.il> writes:
> > On May 7, 11:20 am, Peter Dyballa <Peter_Dyba...@Web.DE> wrote:
> >> Am 07.05.2009 um 08:44 schrieb tomer:
>
> >> > Is it possible ?
>
> >> Yes. ^.*[^-][^-].*$
>
> >> --
> >> Greetings
>
> >>    Pete
>
> >> Who the fsck is "General Failure," and why is he reading my disk?
>
> > I think it is not working
>
> The problem is that you didn't say what you wanted to do.  
> With computers, anything is possible, if you have infinite memory and
> infinite time.
>
> Now you're saying that it is not working.  But you don't tell us what
> is not working, what you did, what you expected and what you got?
> Do people have telepathic powers in your country?
>
> Of your original post:
>
> > i use a language which mark comment with "--".
> > is want to all lines in all buffer ( grep-buffer regular expression)
> > that are not comment.
> > Is it possible ?
> > Thanks
> > Tomer
>
> Only the sentence "Is it possible?" is gramatically correct, and can
> be parsed to something meaningful, if lacking a context.
>
> --
> __Pascal Bourguignon__- Hide quoted text -
>
> - Show quoted text -

Thanks for the reply,
sorry for the unclear question.
I need a regexp which show all line execpt lines which include the
string "--" (the qoute is not part of the sign).
Thanks for the help.

Re: regular expression for hiding comment

[Anselm Helbig]

Hi!

> I need a regexp which show all line execpt lines which include the
> string "--" (the qoute is not part of the sign).

Generally, RegExps suck at "negative matching". You'd rather have a
regexp match all lines that are comments and then do something to the
other lines. There's M-x flush-lines for example, and M-x grep calls
out to the external grep program that has the `-v'-switch. 

It might be possible to construct a regex that does what you want.
Unfortunately, this isn't so easy and Peter's solution is definitely
wrong - it matches any line that contains two adjacent non-dash
characters.  I don't have a quick answer to that one neither - nice
brain teaser. 8-)

HTH, 

Anselm


-- 
Anselm Helbig 
mailto:anselm.helbig+news2009@googlemail.com

RE: regular expression for hiding comment

[Drew Adams]

> I need a regexp which show all line execpt lines which include the
> string "--" (the qoute is not part of the sign).

Sounds like you want `M-x flush-lines RET -- RET'.
(The regexp here is just `--'.)

Re: regular expression for hiding comment

[Pascal J. Bourguignon]

tomer <tomer1levin@walla.co.il> writes:
> Thanks for the reply,
> sorry for the unclear question.
> I need a regexp which show all line execpt lines which include the
> string "--" (the qoute is not part of the sign).

Ah, this is clearer.  

Notice that regexp don't 'show' anything, they 'match' input.  It's
the program that use the regexp that may decide to show or hide lines
depending on whether a regexp match them.

Here is such a regexp matching any line but those containing "--":
  
           ^\([^-]\|-[^-]\)*\(\|-\)$


-- 
__Pascal Bourguignon__

Re: regular expression for hiding comment

[tomer]

On May 7, 7:07 pm, p...@informatimago.com (Pascal J. Bourguignon)
wrote:
> tomer <tomer1le...@walla.co.il> writes:
> > Thanks for the reply,
> > sorry for the unclear question.
> > I need a regexp which show all line execpt lines which include the
> > string "--" (the qoute is not part of the sign).
>
> Ah, this is clearer.  
>
> Notice that regexp don't 'show' anything, they 'match' input.  It's
> the program that use the regexp that may decide to show or hide lines
> depending on whether a regexp match them.
>
> Here is such a regexp matching any line but those containing "--":
>
>            ^\([^-]\|-[^-]\)*\(\|-\)$
>
> --
> __Pascal Bourguignon__

Thanks for the help
I have use hide-lines , i also will try the regexp which is better
choice
Thanks a  a lot

Re: regular expression for hiding comment

[Peter Dyballa]

Am 07.05.2009 um 10:54 schrieb tomer:

> I think it is not working

You're right! I did not test it with incremental regexp search.  
Thinking of it: the greediness of regexp's makes it fail! Since you  
mentioned grep:

	grep -v -e --

will do it. It will also reject lines with more than two -. This  
variant will work exactly:

	egrep -v '[^-]--[^-]'

--
Greetings

   Pete      <\
              _\     O  _
             |o \  _\\_/-\='
_____________(_)|-(_)  (_)___________________________________