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Posted to java-user@lucene.apache.org by Mufaddal Khumri <MK...@allegromedical.com> on 2005/04/07 08:21:59 UTC
Escaping special characters
Hi,
Am new to Lucene. I found the following page:
http://lucene.apache.org/java/docs/queryparsersyntax.html. At the bottom
of the page there is a section that in order to escape special
characters one would use "\".
I have an Indexer that indexes product names. Some product names have
"-" character in them. When I use my search class to search for product
names with - in them it wont find those products.
The code below returns no result.
public void searchIndex()
{
try
{
SearchManager sm = new
ManagerFactory().getSearchManager();
String searchPath = "Product-search-index";
sm.initIndex(searchPath);
sm.buildIndex(this.daoFactory);
String tk = "Chimi-Bose-765";
if(tk.contains("-"));
tk = tk.replaceAll("-" , "\\-");
if(tk != null && tk.trim().equals("") == false)
tk = tk + "*";
else
tk = "";
try
{
Hits hits = sm.search(searchPath, tk);
if(hits != null && hits.length() > 0)
{
int length = hits.length();
log.info(length + " result(s) were found matching
your search criteria.");
for(int i = 0; i < length; i++)
{
Document doc = hits.doc(i);
log.info("Score: " + hits.score(i) + " Product
id = " + doc.getField("id").stringValue() + " prod name = " +
doc.getField("name").stringValue());
}
}
else
log.info("No results were found matching your
search.");
}
catch(IOException ex)
{
ex.printStackTrace();
}
catch(Exception ex)
{
log.info("No results were found matching your
search.");
}
}
catch (Exception ex)
{
ex.printStackTrace();
Assert.fail();
}
}
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Re: Escaping special characters
Posted by Andy Roberts <ma...@andy-roberts.net>.
On Thursday 07 Apr 2005 06:38, Chuck Williams wrote:
> Mufaddal Khumri writes (4/6/2005 11:21 PM):
> >Hi,
> >
> >Am new to Lucene. I found the following page:
> >http://lucene.apache.org/java/docs/queryparsersyntax.html. At the bottom
> >of the page there is a section that in order to escape special
> >characters one would use "\".
> >
> >
> >
> >I have an Indexer that indexes product names. Some product names have
> >"-" character in them. When I use my search class to search for product
> >names with - in them it wont find those products.
>
> How did you index those product names? I.e., if you used a tokenized
> field for the product names and an analyzer that breaks on the hyphens,
> then there are no hyphenated tokens for you to match. I would suggest
> using Luke to browse your index and see what you have.
>
> Chuck
The Lucene In Action book has an excellent chapter on Analysers - well worth a
read. Of particular interest is some code that allows you to see how a given
Analyser tokenises an input string.
You can download the source code from the book
(http://www.lucenebook.com/LuceneInAction.zip). If you unzip this file you
will find a directory called "LuceneInAction/src/lia/analysis" and in there
is a class called AnalyzerDemo (which depends in AnalyzerUtils). Compile this
and run to see how the Analysers work. Put in your hyphenated strings to see
how they work too.
HTH
Andy
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Re: Escaping special characters
Posted by Chuck Williams <ch...@allthingslocal.com>.
Mufaddal Khumri writes (4/6/2005 11:21 PM):
>Hi,
>
>
>
>Am new to Lucene. I found the following page:
>http://lucene.apache.org/java/docs/queryparsersyntax.html. At the bottom
>of the page there is a section that in order to escape special
>characters one would use "\".
>
>
>
>I have an Indexer that indexes product names. Some product names have
>"-" character in them. When I use my search class to search for product
>names with - in them it wont find those products.
>
>
How did you index those product names? I.e., if you used a tokenized
field for the product names and an analyzer that breaks on the hyphens,
then there are no hyphenated tokens for you to match. I would suggest
using Luke to browse your index and see what you have.
Chuck
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