Re: tsearch2 for alphabetic character strings & codes

Ron,

probably you need to write custom parser. tsearch2 supports
different parsers.

Oleg
On Fri, 23 Sep 2005, Ron Mayer wrote:

>
> I'm looking for a way search for substrings strings within
> documents in a way very similar to tsearch2, but my strings
> are not alphabetical codes so I'm having a tough time
> trying to use the current tsearch2 configurations with them.
>
> For example, using tsearch to search for codes like
> '31.03(e)(2)(A)'
> in a set of documents is tricky because tsearch seems
> to treat most of the punctuation as word separators.
>
> fli=# select
> fli-# to_tsvector('default','31.03(e)(2)(A)'),
> fli-# to_tsvector('simple','31.03(e)(2)(A)');
>
> to_tsvector | to_tsvector
> -----------------------+-----------------------------
> '2':3 'e':2 '31.03':1 | '2':3 'a':4 'e':2 '31.03':1
> (1 row)
>
>
> I see that tsearch2 allows different "configurations"
> that appaently differ in how they parse strings.
>
> I guess what I'm looking for is a "configuration"
> that's even simpler-than-simple, and only breaks
> up strings on whitespace and doesn't use any natural
> language dictionaries. I was hoping I could download
> or define such a configuration; but didn't see any
> obvious documentation on how to set up my own
> configuration.
>
> Does this sound like a good approach (and if so, could
> someone please point me in the right direction), or
> are there other things I should be looking to.
>
> Ron
>
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Regards,
Oleg
_____________________________________________________________
Oleg Bartunov, sci.researcher, hostmaster of AstroNet,
Sternberg Astronomical Institute, Moscow University (Russia)
Internet: oleg(at)sai(dot)msu(dot)su, http://www.sai.msu.su/~megera/
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