I just learned Parse::RecDescent yesterday and I wanted to try it. Consider this an example of how not to solve the problem.

use warnings;
use strict;
use Parse::RecDescent;
use Data::Dumper;

my $string = <<END;
JOB ID=EX1J DESC='JOB1'
JOB ID=EX2J DESC='JOB2'
JOB ID=EX3J DESC='JOB3'
JOB ID=EX4J DESC='JOB3'
EX4J PRED EX2J
EX3J PRED EX1J
EX4J PRED EX1J
END

our %data;
my $parser = Parse::RecDescent->new (q{
    startrule  : jobphrase(s) exphrase(s) 
    jobphrase  : "JOB ID=" ex "DESC=" jobquote  
                {
                    $::data{$item[2]}{'desc'} = $item[4]; 
                    $::data{$item[2]}{'pred'} ||=[]
                }
    exphrase   : ex "PRED" ex 
                {
                    push @{$::data{$item[1]}{'pred'}}, @item[3] 
                } 
    jobquote   : "'" job "'" {$return = $item[2]}
    ex         : /EX\dJ/
    job        : /JOB\d/
    });

$parser->startrule($string);

print Dumper \%data;

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In reply to Re: Best way to sort these strings ? recursive way ? use Parse::RecDescent? by chester
in thread Best way to sort these strings ? recursive way ? use Parse::RecDescent? by bertigo

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