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From Mark Miller <markrmil...@gmail.com>
Subject Re: Phrase search using quotes -- special Tokenizer
Date Sat, 02 Sep 2006 13:54:52 GMT
I think if he wants to use the queryparser to parse his search strings 
that he has no choice but to modify it. It will eat any pair of quotes 
going through it no matter what analyzer is used.

- Mark
> Well, you're flying blind. Is the behavior rooted in the indexing or
> querying? Since you can't answer that, you're reduced to trying random
> things hoping that one of them works. A little like voodoo. I've wasted
> faaaaarrrrrr too much time trying to solve what I was *sure* was the 
> problem
> only to find it was somewhere else (the last place I look, of course) 
> <G>...
>
> Using Luke on a RAMDir. No, I don't know how to, but it should be a 
> simple
> thing to write the index to an FSDir at the same time you create your 
> RAMDir
> and use Luke then. This is debugging, after all.
>
> I'd be really, really, really reluctant to modify the query parser and/or
> the tokenizer, since whenever I've been tempted it's usually because I 
> don't
> understand the tools already provided. Then I have to maintain my custom
> code. Which sucks. Although it sure feels more productive to hack a 
> bunch of
> code and get something that works 90% of the time, then spend weeks 
> making
> the other 10% work than taking two days to find the 3 lines you *really*
> need <G>.
>
> Have you thought of a PatternAnalyzer? It takes a regular expression 
> as the
> tokenizer and  (from the Javadoc)
> <<< Efficient Lucene analyzer/tokenizer that preferably operates on a 
> String
> rather than a 
> Reader<http://java.sun.com/j2se/1.4/docs/api/java/io/Reader.html>,
> that can flexibly separate text into terms via a regular expression
> Pattern<http://java.sun.com/j2se/1.4/docs/api/java/util/regex/Pattern.html>(with

>
> behaviour identical to
> String.split(String)<http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html#split%28java.lang.String%29>),

>
> and that combines the functionality of
> LetterTokenizer<file:///C:/lucene_1.9.1/docs/api/org/apache/lucene/analysis/LetterTokenizer.html>,

>
> LowerCaseTokenizer<file:///C:/lucene_1.9.1/docs/api/org/apache/lucene/analysis/LowerCaseTokenizer.html>,

>
> WhitespaceTokenizer<file:///C:/lucene_1.9.1/docs/api/org/apache/lucene/analysis/WhitespaceTokenizer.html>,

>
> StopFilter<file:///C:/lucene_1.9.1/docs/api/org/apache/lucene/analysis/StopFilter.html>into

>
> a single efficient multi-purpose class.>>>
>
> One word of caution, the regular expression consists of expressions that
> *break* tokens, not expressions that *form* words, which threw me at 
> first.
> Just like the doc says, like splitstring <G>.... This is in 2.0, 
> although I
> *believe* it's also in the contrib section of 1.9 (or is in the 
> regular API,
> I forget).
>
> Best
> Erick
>
> On 9/1/06, Philip Brown <pmb@us.ibm.com> wrote:
>>
>>
>> No, I've never used Luke.  Is there an easy way to examine my 
>> RAMDirectory
>> index?  I can create the index with no quoted keywords, and when I 
>> search
>> for a keyword, I get back the expected results (just can't search for a
>> phrase that has whitespace in it).  If I create the index with 
>> phrases in
>> quotes, then when I search for anything in double quotes, I get back
>> nothing.  If I create the index with everything in quotes, then when I
>> search for anything by the keyword field, I get nothing, regardless of
>> whether I use quotes in the query string or not.  (I can get results 
>> back
>> by
>> searching on other fields.)  What do you think?
>>
>> Philip
>>
>>
>> Erick Erickson wrote:
>> >
>> > OK, I've gotta ask. Have you examined your index with Luke to see if
>> what
>> > you *think* is in the index actually *is*???
>> >
>> > Erick
>> >
>> > On 9/1/06, Philip Brown <pmb@us.ibm.com> wrote:
>> >>
>> >>
>> >> Interesting...just ran a test where I put double quotes around
>> everything
>> >> (including single keywords) of source text and then ran searches 
>> for a
>> >> known
>> >> keyword with and without double quotes -- doesn't find either time.
>> >>
>> >>
>> >> Mark Miller-5 wrote:
>> >> >
>> >> > Sorry to hear you're having trouble. You indeed need the double
>> quotes
>> >> in
>> >> > the source text. You will also need them in the query string. Make
>> sure
>> >> > they
>> >> > are in both places. My machine is hosed right now or I would do it
>> for
>> >> you
>> >> > real quick. My guess is that I forgot to mention...no only do you
>> need
>> >> to
>> >> > add the <QUOTED> definiton to the TOKEN section, but below that
you
>> >> will
>> >> > find the grammer...you need to add <QUOTED> to the grammer. If
you
>> look
>> >> > how
>> >> > <NUM> and <APOSTROPHE> are done you will prob see what
you 
>> should do.
>> >> If
>> >> > not, my machine should be back up tomarrow...
>> >> >
>> >> > - Mark
>> >> >
>> >> > On 9/1/06, Philip Brown <pmb@us.ibm.com> wrote:
>> >> >>
>> >> >>
>> >> >> Well, I tried that, and it doesn't seem to work still.  I would
be
>> >> happy
>> >> >> to
>> >> >> zip up the new files, so you can see what I'm using -- maybe 
>> you can
>> >> get
>> >> >> it
>> >> >> to work.  The first time, I tried building the documents without
>> >> quotes
>> >> >> surrounding each phrase.  Then, I retried by enclosing every 
>> phrase
>> >> >> within
>> >> >> double quotes.  Neither seemed to work.  When constructing the

>> query
>> >> >> string
>> >> >> for the search, I always added the double quotes (otherwise, it'd
>> >> think
>> >> >> it
>> >> >> was multiple terms).  (I didn't even test the underscore and
>> >> hyphenated
>> >> >> terms.)  I thought Lucene was (sort of by default) set up to 
>> search
>> >> >> quoted
>> >> >> phrases.  From 
>> http://lucene.apache.org/java/docs/api/index.html -->
>> A
>> >> >> Phrase is a group of words surrounded by double quotes such as
>> "hello
>> >> >> dolly".  So, this should be easy, right?  I must be missing
>> something
>> >> >> stupid.
>> >> >>
>> >> >> Thanks,
>> >> >>
>> >> >> Philip
>> >> >>
>> >> >>
>> >> >> Mark Miller-5 wrote:
>> >> >> >
>> >> >> > So this will recognize anything in quotes as a single token
and
>> '_'
>> >> and
>> >> >> > '-' will not break up words. There may be some repercussions
for
>> the
>> >> >> NUM
>> >> >> > token but nothing I'd worry about. maybe you want to use Unicode
>> for
>> >> >> '-'
>> >> >> > and '_' as well...I wouldn't worry about it myself.
>> >> >> >
>> >> >> > - Mark
>> >> >> >
>> >> >> >
>> >> >> > TOKEN : {                      // token patterns
>> >> >> >
>> >> >> >   // basic word: a sequence of digits & letters
>> >> >> >   <ALPHANUM: (<LETTER>|<DIGIT>|<KOREAN>)+
>
>> >> >> >
>> >> >> > | <QUOTED:     "\"" (~["\""])+ "\"">
>> >> >> >
>> >> >> >   // internal apostrophes: O'Reilly, you're, O'Reilly's
>> >> >> >   // use a post-filter to remove possesives
>> >> >> > | <APOSTROPHE: <ALPHA> ("'" <ALPHA>)+ >
>> >> >> >
>> >> >> >   // acronyms: U.S.A., I.B.M., etc.
>> >> >> >   // use a post-filter to remove dots
>> >> >> > | <ACRONYM: <ALPHA> "." (<ALPHA> ".")+ >
>> >> >> >
>> >> >> >   // company names like AT&T and Excite@Home.
>> >> >> > | <COMPANY: <ALPHA> ("&"|"@") <ALPHA> >
>> >> >> >
>> >> >> >   // email addresses
>> >> >> > | <EMAIL: <ALPHANUM> (("."|"-"|"_") <ALPHANUM>)*
"@" <ALPHANUM>
>> >> >> > (("."|"-") <ALPHANUM>)+ >
>> >> >> >
>> >> >> >   // hostname
>> >> >> > | <HOST: <ALPHANUM> ("." <ALPHANUM>)+ >
>> >> >> >
>> >> >> >   // floating point, serial, model numbers, ip addresses,
etc.
>> >> >> >   // every other segment must have at least one digit
>> >> >> > | <NUM: (<ALPHANUM> <P> <HAS_DIGIT>
>> >> >> >        | <HAS_DIGIT> <P> <ALPHANUM>
>> >> >> >        | <ALPHANUM> (<P> <HAS_DIGIT> <P>
<ALPHANUM>)+
>> >> >> >        | <HAS_DIGIT> (<P> <ALPHANUM> <P>
<HAS_DIGIT>)+
>> >> >> >        | <ALPHANUM> <P> <HAS_DIGIT> (<P>
<ALPHANUM> <P>
>> >> <HAS_DIGIT>)+
>> >> >> >        | <HAS_DIGIT> <P> <ALPHANUM> (<P>
<HAS_DIGIT> <P>
>> >> <ALPHANUM>)+
>> >> >> >         )
>> >> >> >   >
>> >> >> > | <#P: ("_"|"-"|"/"|"."|",") >
>> >> >> > | <#HAS_DIGIT:                      // at least one digit
>> >> >> >     (<LETTER>|<DIGIT>)*
>> >> >> >     <DIGIT>
>> >> >> >     (<LETTER>|<DIGIT>)*
>> >> >> >   >
>> >> >> >
>> >> >> > | < #ALPHA: (<LETTER>)+>
>> >> >> > | < #LETTER:                      // unicode letters
>> >> >> >       [
>> >> >> >        "\u0041"-"\u005a",
>> >> >> >        "\u0061"-"\u007a",
>> >> >> >        "\u00c0"-"\u00d6",
>> >> >> >        "\u00d8"-"\u00f6",
>> >> >> >        "\u00f8"-"\u00ff",
>> >> >> >        "\u0100"-"\u1fff",
>> >> >> >        "-", "_"
>> >> >> >       ]
>> >> >> >   >
>> >> >> >
>> >> >> >
>> >> ---------------------------------------------------------------------
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>> >> >> > For additional commands, e-mail: 
>> java-user-help@lucene.apache.org
>> >> >> >
>> >> >> >
>> >> >> >
>> >> >>
>> >> >> --
>> >> >> View this message in context:
>> >> >>
>> >>
>> http://www.nabble.com/Phrase-search-using-quotes----special-Tokenizer-tf2200760.html#a6106920

>>
>> >> >> Sent from the Lucene - Java Users forum at Nabble.com.
>> >> >>
>> >> >>
>> >> >>
>> ---------------------------------------------------------------------
>> >> >> To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
>> >> >> For additional commands, e-mail: java-user-help@lucene.apache.org
>> >> >>
>> >> >>
>> >> >
>> >> >
>> >>
>> >> --
>> >> View this message in context:
>> >>
>> http://www.nabble.com/Phrase-search-using-quotes----special-Tokenizer-tf2200760.html#a6107649

>>
>> >> Sent from the Lucene - Java Users forum at Nabble.com.
>> >>
>> >>
>> >> ---------------------------------------------------------------------
>> >> To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
>> >> For additional commands, e-mail: java-user-help@lucene.apache.org
>> >>
>> >>
>> >
>> >
>>
>> -- 
>> View this message in context:
>> http://www.nabble.com/Phrase-search-using-quotes----special-Tokenizer-tf2200760.html#a6109067

>>
>> Sent from the Lucene - Java Users forum at Nabble.com.
>>
>>
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>>
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