Hi Schlomi, thank you so much for such a quick response.
On Thu, 2011-08-25 at 11:56 +0300, Shlomi Fish wrote:
> ׁHi Honza,
>
> On Thu, 25 Aug 2011 10:42:20 +0200
> Honza Mach <jan.m...@cesnet.cz> wrote:
>
> > Hi everybody,
> >
> > I was wondering, if it is possible to use backreferences in the pattern
> > repetition bracket operator.
> >
> > Consider the following string:
> >
> > my $string = "5 abcdefghijklmn";
> >
> > The number five at the beginning of the string means, that I want to
> > extract first five characters from the latter part of the string. I
> > tried the following code, but it doesn`t work:
> >
> > $string =~ s/(\d+)\s+(.{\g1})//;
> > print "extracted: $1 $2\n";
> >
> > The desired output would be:
> >
> > extracted: 5 abcde
> >
> > It seems, that it is not possible to use backreferences within the
> > bracket operator (or am I doing something wrong?).
> >
>
> I don't think it's possible, because the perl regex engine is not that smart.
That`s a pity, but I will walk around it somehow.
> > Is there other solution to my problem.
> >
>
> You can use incremental parsing using \G and /g. See:
>
> http://perl-begin.org/uses/text-parsing/
Thank you for the tip, I will check it out.
> Regards,
>
> Shlomi Fish
>
Regards
Honza Mach
> --
> -----------------------------------------------------------------
> Shlomi Fish http://www.shlomifish.org/
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>
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