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#!/usr/bin/perl -ws
use Parse::RecDescent;
use Data::Dumper;
use Parse::RecDescent;
my $grammar = <<'EOGRAMMAR';
{ my %patterns; }
query: { %patterns=() }
pattern(s) end_of_query
{ $return = { %patterns } }
| <error>
end_of_query: /\Z/
pattern: '+' string { push @{$patterns{required}}, $item[2] }
| '-' string { push @{$patterns{excluded}}, $item[2] }
| string { push @{$patterns{optional}}, $item[1] }
| <error>
string: quoted_string
| bareword
quoted_string:
{ my $string = extract_delimited($text,q{'"});
$return = substr($string,1,length($string)-2) if $string; }
bareword: /\w+/
EOGRAMMAR
my $parser = Parse::RecDescent->new($grammar) or die;
while (<>)
{
my $query = $parser->query($_);
print Data::Dumper->Dump([$query],['query']);
}