Greetings Dr.Altaica,

You have an interesting situation. I'm sure there must be a module out there that does nearly exactly what you want, but since you specifically asked for something that will work "only in the standared distubution of Perl," here's my code:

#!/usr/bin/perl -w
use strict;

my $input = '[S [NP This NP] [VP is [NP [NP the turning point NP] ' . 
    '[PP to [NP the left NP] PP] NP] VP] . S]';

$input =~ s/^\[S\s*(.*?)\s*S\]$/$1/;

my $bracket_count = 0;
my @output;
my $build_var;

foreach (split(//, $input)) {
    $build_var .= $_;

    if (/\[/) {
        $bracket_count++;
    } elsif (/\]/) {
        $bracket_count--;
    }

    if ($bracket_count == 0) {
        push @output, $build_var if ($build_var ne ' ');
        $build_var = '';
    }
}

foreach (@output) {
    print '"', $_, '"', "\n";
}

[download]

It's not fancy or nice, and probably will need to be patched a bit for situations that fall outside of your given example. However, it does seem to return the results that you want.

-gryphon
code('Perl') || die;

In reply to Re: Non deliminatd Nested text by gryphon
in thread Non deliminatd Nested text by Dr.Altaica

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