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Posted to solr-user@lucene.apache.org by JZ <zh...@gmail.com> on 2013/07/03 16:59:26 UTC

Search for string ending with question mark

Hi all,

Currently, I am experimenting with the tokenizers.

Assume, I have the values: "2013?", "1900?", "87?".

I want to retrieve all values that end with the question mark as literal.

How do I need to define the <fieldType> in the schema.xml to allow for such
a query?

I assume it would be like: *\?

Is this possible in Lucene/Solr?

Cheers

Re: Search for string ending with question mark

Posted by JZ <zh...@gmail.com>.

Thanks! Unfortunately it is not working. I use Solr 3.6.2.

This is how I have defined the field type:

    <fieldType name="textgen2" class="solr.TextField"
positionIncrementGap="100">
      <analyzer type="index">
          <tokenizer class="solr.WhitespaceTokenizerFactory" />
          <filter class="solr.LowerCaseFilterFactory" />
      </analyzer>
      <analyzer type="query">
          <tokenizer class="solr.WhitespaceTokenizerFactory" />
          <filter class="solr.LowerCaseFilterFactory" />
      </analyzer>
    </fieldType>

When I query for "*\?" I still get false positives, i.e. values that do not
end with a question mark.

Am I missing something very trivial?

Cheers



On Wed, Jul 3, 2013 at 5:28 PM, Jack Krupansky <ja...@basetechnology.com>wrote:

> Most tokenizers would treat "?" as punctuation - to be ignored. The white
> space tokenizer will preserve all punctuation.
>
> Or, use a raw string field ("string"/StrField).
>
> In either case, you would need to escape the "?" in the query parser (with
> a backslash) since it is a wildcard character.
>
> Yes, string_field:*\? should match any string field that ends with a "?".
>
> -- Jack Krupansky
>
> -----Original Message----- From: JZ
> Sent: Wednesday, July 03, 2013 10:59 AM
> To: solr-user@lucene.apache.org
> Subject: Search for string ending with question mark
>
>
> Hi all,
>
> Currently, I am experimenting with the tokenizers.
>
> Assume, I have the values: "2013?", "1900?", "87?".
>
> I want to retrieve all values that end with the question mark as literal.
>
> How do I need to define the <fieldType> in the schema.xml to allow for such
> a query?
>
> I assume it would be like: *\?
>
> Is this possible in Lucene/Solr?
>
> Cheers
>

Re: Search for string ending with question mark

Posted by Jack Krupansky <ja...@basetechnology.com>.

Most tokenizers would treat "?" as punctuation - to be ignored. The white 
space tokenizer will preserve all punctuation.

Or, use a raw string field ("string"/StrField).

In either case, you would need to escape the "?" in the query parser (with a 
backslash) since it is a wildcard character.

Yes, string_field:*\? should match any string field that ends with a "?".

-- Jack Krupansky

-----Original Message----- 
From: JZ
Sent: Wednesday, July 03, 2013 10:59 AM
To: solr-user@lucene.apache.org
Subject: Search for string ending with question mark

Hi all,

Currently, I am experimenting with the tokenizers.

Assume, I have the values: "2013?", "1900?", "87?".

I want to retrieve all values that end with the question mark as literal.

How do I need to define the <fieldType> in the schema.xml to allow for such
a query?

I assume it would be like: *\?

Is this possible in Lucene/Solr?

Cheers