Hello Christian,
Thanks for your sophisticated solution.
Works like a charm.
Thinking I'm a Pro, you showed me the limits.Thx!

Offtopic:
What software do you recommend for daily use
(browser,email-client,development,...) ?
Suckless and simple ?

Best Regards

Stephan
On Thu, Aug 03, 2017 at 09:03:56PM +0200, Christian Brabandt wrote:
> 
> On Do, 03 Aug 2017, Stephan Sinz wrote:
> 
> > I want to fold lines starting with similar ip addresses in a log file.
> > 
> >  ":set
> > foldexpr=getline(v:lnum)=~'^\\([0-9]\\+\\)\\.'&&getline(v:lnum+1)=~'^\\1\\.'"
> > 
> > doesn't work for folding similar ip adresses. what's wrong ?
> 
> That doesn't work, because the =~ operation does not understand the \1 
> marked group. BTW: for more complex expressions, it is a alot easier to 
> write specific functions, instead on trying to squeeze everything into a 
> single command line and having to double escape all kind of things...
> 
> This should work:
> 
> function! MyFoldExpr(lnum)
>     let content = getline(a:lnum)
>     let next_cont = getline(a:lnum+1)
>     if content =~ '\.' && next_cont =~ '\.'
>         if split(content, '\.')[0] == split(next_cont, '\.')[0]
>             return 1
>         else
>             " does not match, fold should end here
>             return '<1'
>         endif
>     else
>         " use foldlevel from previous line, if line contains a '.'
>         return content =~ '\.' ? '=' : 0
>     endif
> endfunction
> 
> 
> Best,
> Christian
> -- 
> Manche wären sehr erstaunt zu erfahren, worauf ihre Achtung vor den 
> Menschen beruht.
>               -- Luc de Clapiers Vauvenargues (Nachgelassene Maximen)
> 
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