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Posted to java-user@lucene.apache.org by Lance Norskog <go...@gmail.com> on 2007/09/14 22:01:03 UTC

UTF-8/unicode input in querying in Lucene 

Hi-
 
The page http://lucene.apache.org/java/docs/queryparsersyntax.html does not
mention that \uNNNN Unicode syntax is supported.
For example, \u0048\u0045\u004c\u004c\u004f is HELLO.
 
Please add this to the page, it took experimentation to discover it.
 
Thanks,
 
Lance Norskog

Re: UTF-8/unicode input in querying in Lucene

Posted by Chris Hostetter <ho...@fucit.org>.
: > I don't believe the QueryParser actually treats \uNNNNN as a special
: > syntax
: 
: LUCENE-716 added unicode escapes.

doh!  that's what i get for assuming the random solr port i used to sanity 
check my assumption was relatively up to date.

LUCENE-1000



-Hoss


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Re: UTF-8/unicode input in querying in Lucene

Posted by Yonik Seeley <yo...@apache.org>.
On 9/14/07, Chris Hostetter <ho...@fucit.org> wrote:
> I don't believe the QueryParser actually treats \uNNNNN as a special
> syntax

LUCENE-716 added unicode escapes.

-Yonik

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Re: UTF-8/unicode input in querying in Lucene

Posted by Chris Hostetter <ho...@fucit.org>.
: The page http://lucene.apache.org/java/docs/queryparsersyntax.html does not
: mention that \uNNNN Unicode syntax is supported.
: For example, \u0048\u0045\u004c\u004c\u004f is HELLO.
:  
: Please add this to the page, it took experimentation to discover it.

I don't believe the QueryParser actually treats \uNNNNN as a special 
syntax ... what you may have encountered was that when *javac* parses a 
literal string constant, those sequences have special meaning -- but they 
are already the literal unicode characters long before QueryParser sees 
them.

As far as query parser is concerned the backslash in \uNNNNN is only 
escaping the "u"  (all characters can be escaped, wether they need it or 
not)



-Hoss


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