Just read the docs in contrib/tsearch2 in the PostgreSQL distribution.
Pierre A. Fortier wrote:
> I search for particular strings using regular expressions (e.g. where
> column ~* $query) through a text data type column which contains notes
> (some html code like <b>bold</b> is included).
>
> It works but my question is whether there would be a way to speed up
> searches?
>
>From my limited investigation, I see the features "CREATE INDEX" and
> "tsearch2" but I'm not clear on how these work, whether they would be
> appropriate, and whether there would be a better approach.
>
> I'd appreciate being pointed in the right direction.
>
> Pierre
>
>
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