Q for regexp experts

[Ludwig Callewaert]

Ludwig Callewaert wrote:
> 
> Harald Kirsch wrote:
> >
> > Even with perl-compatible regular expressions it seems to be
> > impossible to specify a pattern which matches
> >
> >    `the longest substring not containing separator' SEP
> >
> > Put another way, from a given starting point, the pattern shall match
> > everything until just before the next occurence of SEP. A first
> > attempt is something like
> >
> >    [^SEP]*
> >
> > but this disallows S', 'E' and 'P' in between the separators.
> >
> > I tried something like (.(?!SEP))+ but it somehow does not work. Is it
> > at all possible to get this to work with regular expressions?
> >
> >   Harald Kirsch
> >
> > --
> > ----------------+------------------------------------------------------
> > Harald Kirsch   | kirschh at lionbioscience.com | "How old is the epsilon?"
> > LION Bioscience | +49 6221 4038 172          |        -- Paul Erdös
> 
> What about:
> 
> set s "the longest matching String not containing SEP"
> 
> regexp -- ".*(?=SEP)" $s match
Ooops,

forgot the non-greedy part


regexp -- "(.*?)(?=SEP)" $s match

> 
> puts $match
> 
> > the longest matching String not containing
> 
> Ludwig
> 
> --
> 
> Ludwig Callewaert       e-mail: ludwig_callewaert at frontierd.com
> Senior Software Engineer        Frontier Design, Belgium
> __________________________________________________________________

-- 

Ludwig Callewaert       e-mail: ludwig_callewaert at frontierd.com
Senior Software Engineer        Frontier Design, Belgium
__________________________________________________________________