search for token starting with a wildcard

[v....@lombardodier.com]

Hi,

I have a large index with a field that contains a important number of 
terms. I knew that searching with a term starting with a wildcard was not 
a good idea; looking at WildcardTermEnum(IndexReader,Term) and 
IndexReader.terms(Term) I understand better why now. I have been asked 
however by my users to provide this type of feature. do you plan to 
address this in the future, or are there any workarounds? how do people do 
when they really need to be able to search for terms that start with 
wildcards?
thanks
vince


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Re: search for token starting with a wildcard

[Erick Erickson <er...@gmail.com>]

Typically, they index the text in reverse order
as well as forward order (similar to synonyms)
so if you have a term in your field
"reverse", you index "esrever" and now your
leading-wildcard search for "*verse" becomes
a trailing search for "esrev*".

There is an implementation in Solr, see:
http://wiki.apache.org/solr/AnalyzersTokenizersTokenFilters#solr.ReversedWildcardFilterFactory
that you might be able to get some ideas from.

Best
Erick


On Thu, Apr 12, 2012 at 3:59 AM,  <v....@lombardodier.com> wrote:
> Hi,
>
> I have a large index with a field that contains a important number of
> terms. I knew that searching with a term starting with a wildcard was not
> a good idea; looking at WildcardTermEnum(IndexReader,Term) and
> IndexReader.terms(Term) I understand better why now. I have been asked
> however by my users to provide this type of feature. do you plan to
> address this in the future, or are there any workarounds? how do people do
> when they really need to be able to search for terms that start with
> wildcards?
> thanks
> vince
>
>
> ************************ DISCLAIMER ************************
> This message is intended only for use by the person to
> whom it is addressed. It may contain information that is
> privileged and confidential. Its content does not
> constitute a formal commitment by Lombard Odier & Cie
> or any of its branches or affiliates.
> If you are not the intended recipient of this message,
> kindly notify the sender immediately and destroy this
> message. Thank You.
> *****************************************************************

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