Mailing-List: contact user-help@lucy.apache.org; run by ezmlm
Precedence: bulk
Reply-To: user@lucy.apache.org
Sender: Peter Karman <peknet@gmail.com>
Reply-To: peter@peknet.com
To: user@lucy.apache.org
References: <pony-028d9b5d7a97a3b9f760ca80d5e077afa96ac73b-67b79126a9aba72a7d4c3d70fc9435c2adfdc297@user.lucy.apache.org>
From: Peter Karman <peter@peknet.com>
Message-ID: <c8d3b289-903b-d78e-5d8b-18e7f7f46486@peknet.com>
Date: Thu, 8 Jun 2017 22:12:48 -0500
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0)
 Gecko/20100101 Thunderbird/52.1.1
MIME-Version: 1.0
In-Reply-To: <pony-028d9b5d7a97a3b9f760ca80d5e077afa96ac73b-67b79126a9aba72a7d4c3d70fc9435c2adfdc297@user.lucy.apache.org>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Subject: Re: [lucy-user] C Library: Regex query
archived-at: Fri, 09 Jun 2017 03:12:57 -0000

Serkan Mulayim wrote on 6/8/17 7:12 PM:
> Hi guys,
> 
> I would like to ask if it is possible to do regex queries (without adding new fields, and tokenizing differently) in the C library. What I need to do is to be able to be able to return documents based on file name suffix. So that a query as (*.pdf) should return all documents that contain a PDF file type.
> 
> I can understand the complexity it creates for the searcher to do a suffix query. But in my use case there would not be many files that are associated with the documents. So that attachment fields will exist for small number of documents.
> 
> If this is not possible, I will also index the documents with their file types in a new field. (or reverse the attachment names).
> 

afaik there is no C implementation of the Regex query. I wrote the Perl version.

https://metacpan.org/release/LucyX-Search-WildcardQuery

You will be *much* happier with storing the file extension as a separate field 
and searching on that. Far far more efficient at search time than munging a regex.


-- 
Peter Karman  .  https://karpet.github.io  .  https://keybase.io/peterkarman