Kurapica,
I'd use contrib/pg_trgm for your application.
Олег
On Tue, 26 Dec 2006, Alvaro Herrera wrote:
> Kurapica wrote:
>
>> I am developing an application which searches for city names in a
>> column. There is a lot of cities and I have to 'like' every name which
>> is not effective enough. So I want to know whether pgsql's regex
>> processor can optimize regexes such as:
>>
>> Nebraska|Nevada|North Carolina
>> to
>> N(e(braska|vada)|orth Carolina)
>>
>> If the processor can do that like a Dictionary-Tree, it may be
>> affordable to me or else I have to write a matcher myself.
>>
>> Any suggestion is appreciated. Thank you and appologize for my poor English.
>
> Compared to the use of indexes to skip whole table scanning, this
> optimization is going to have very little impact. So don't worry about
> it.
>
>
Regards,
Oleg
_____________________________________________________________
Oleg Bartunov, Research Scientist, Head of AstroNet (www.astronet.ru),
Sternberg Astronomical Institute, Moscow University, Russia
Internet: oleg@sai.msu.su, http://www.sai.msu.su/~megera/
phone: +007(495)939-16-83, +007(495)939-23-83
