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tsearch2 and case

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First of all: Happy Independence Day.

I've got a quick question for those with tsearch2 experience.
I set tsearch2 up and it works great (although I'd like to search for phrases 
too, but I guess that's not supported at this time).
Anyways, I noted that the search seems to be case sensitive for some search 
terms, particularly abbreviations. So if I'm searching with

to_tsquery('ABCD')  - where ABCD is a standard abbreviation, I get a lot of 
hits, but I get none with to_tsquery('abcd') because the abbreviation is 
always upper case in my text.

I'd like the search to be completely case insensitive. Can anyone point me in 
the right direction?

Thanks for any help.

	UC

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