Re: extract lines with regexp

[Sebastien Le Maguer <Sebastien.Le_Maguer@irisa.fr>]

In fact I need just the line before theq ().

All lines, except thoses which begin with  "theq", respect the same 
topology :
../rep1/rep2/nom_ficXXX_refXX_sentX.wav

I can use your code to build what what I want. I will send my solution 
when it will be finished

Thanks a lot

Xah Lee a écrit :
> On Apr 30, 1:09 am, Sebastien LE MAGUER <Sebastien.Le_mag...@irisa.fr>
> wrote:
>   
>> Hi,
>>
>> I wonder how to extract lines using a regexp. My file contains something
>> like that :
>>
>> <useless lines>
>> <line X>
>> theq() :
>> <useless lines>
>>
>> and I want to extract all lines before theq (here line X)
>>
>> does anyone have an idea ?
>>     
>
> regex is very limited in extracting text that span multiple lines.
>
> what you want can be done in emacs, but we need a bit more detail. For
> example, what pattern does the lines you want start? “All lines before
> theq” doesn't specify how it starts.
>
> A better solution is to use search-forward-regexp to search the begin
> pattern, mark, then search-forward-regexp again to search for the
> ending pattern “theq() :”, then do search-backward-regexp to move
> point to the beginning of “theq”. Then, grab the region.
>
> here's some pieces of code (untested):
>
> (let (p1 p2)
>   (save-excursion
>     (goto-char (point-min))
>     (search-forward-regexp "^A.+$") ; begin pattern
>     (setq p1 (point)) ; save cursor pos
>     (search-forward-regexp "theq() :") ; ending pattern
>     (backward-char 8)
>     (setq p2 (point)) ; save cursor pos
>     (setq mytext (buffer-substring p1 p2))
>     )
>   )
>
>   Xah
> ∑ http://xahlee.org/
>
> ☄
>