ׁ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.
> Is there other solution to my problem.
>
You can use incremental parsing using \G and /g. See:
http://perl-begin.org/uses/text-parsing/
Regards,
Shlomi Fish
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