I question whether your example actually searches what you
think. What I suggest is that you get a copy of Luke and
look at what your queries actually produce. That'll give you
a much better idea of what happens under the covers.
Also, query.toString() is your friend. Try printing out your
queries (again, I recommend a small test program) to get
a better feel for what each analyzer does to your queries.
Of course you have to escape the ':' character when it does
not refer to a field. How else could you imagine that the
query parser can distinguish between a field designation
and a field value? Consider the query:
f:stuff g:morestuff
The parser has to understand that the ':' separates the
field 'f' from the value 'stuff' and that 'g' is another field. So
if you want to parse
f:stuff g:somemore:stuff
the parser gets all confused by whether the ':' between
somemore and stuff is a field delimiter or a value, unless
it's escaped.
Best
Erick
On Tue, Sep 16, 2008 at 9:49 AM, miztaken wrote:Hi there,
I will check that out but what do you suggest for searching??
without escaping works for query string "fw: fyi.dat" but i have to escape
:
char for query string "fw:" so i am having two cases?
Please help me
Erick Erickson wrote:
You can easily answer the questions about what WhitespaceTokenizer
produces by getting a copy of Luke and looking at your index. Or writing
a really simple test program that prints out tokens.
At the bottom of this page is a list of special characters for escaping:
http://lucene.apache.org/java/docs/queryparsersyntax.htmlBest
Erick
On Tue, Sep 16, 2008 at 9:05 AM, miztaken wrote:
Hi there,
I am using WhiteSpaceAnalyser to index documents. I have used this
because
i
need to split tokens based on space only. Also Tokensized=true
While indexing what does it do with special characters like + - && || !
(
)
{ } [ ] ^ " ~ * ? : \, will these characters be indexed or will be
chopped
off? I am confused about this.
Now i am having problem while searching as well..
for query strings like "jason dartling (e-mail)" and "re: fyi.dat", i
don't
have to escape the special characters ( , ) and : but for input such as
"re:" queryParser is producing error so i have escaped characters here.
So it seems like i have two cases to deal with..
Can anyone suggest me one generic way to deal with both the cases?
Basically how to index and search string with escape characters will be
my
generalized question?
Please help me
miztaken
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