[lucy-user] How to search through the indexed documents by specifying wildcards in the query string

[Saurabh Vasekar <sv...@listenlogic.com>]

Hello,

I want to search through the indexed documents with the following query.
e.g.

"+field1:abc AND -field2:def AND +field3:xyz"

My code looks as below -

my $q = "+field1:abc AND -field3:def AND +field3:xyz";

my $searcher = Lucy::Search::IndexSearcher->new(
       index => $path_to_index,
);

my $qparser = Lucy::Search::QueryParser->new(
       schema => $searcher->get_schema,
);

my $query = $qparser->parse($q);

my $hits = $searcher->hits(
       query => $query,
       offset => $offset,
      num_wanted => $page_size,
);

I read the info on the link
https://metacpan.org/module/Lucy::Search::QueryParser#___pod

It says that I need to use a method set_heed_colons(). But I am not able to
figure out how many arguments should be provided to the method?
What exactly does set_heed_colon method do?

I supplied argument '3' because my query string contained 3 fields.
Surprisingly my code worked but I don't know how.
Can anybody please throw light on this?

Also where can I find the wildcard characters supported by Lucy query
parser? A lot of wildcard characters have been supported by Lucene.
What do I need to specify in the query string if I need all the documents
present. (e.g. * wildcard character or something like that)

Thank you.

Re: [lucy-user] How to search through the indexed documents by specifying wildcards in the query string

[Peter Karman <pe...@peknet.com>]

On 6/13/12 7:17 PM, Saurabh Vasekar wrote:

> It says that I need to use a method set_heed_colons(). But I am not able to
> figure out how many arguments should be provided to the method?
> What exactly does set_heed_colon method do?

The method sets a boolean (on/off) so passing any true value turns it 
on, passing any false value should turn it off.

With the value set to true, these 2 query strings are treated the same way:

  field1=foo
  field1:foo

with the value set to false, they are not.


> Also where can I find the wildcard characters supported by Lucy query
> parser? A lot of wildcard characters have been supported by Lucene.
> What do I need to specify in the query string if I need all the documents
> present. (e.g. * wildcard character or something like that)
>

Lucy core does not support wildcards. This extension does:

  http://search.cpan.org/dist/LucyX-Search-WildcardQuery/


-- 
Peter Karman  .  http://peknet.com/  .  peter@peknet.com