highlighting search results using Postgresql GIN/GiST

Question

Is there a built in way of highlighting matched search keywords when using Postgresql's GIN or GiST index? Or if not, a way of doing this outside Postgresql?

I'm using PHP 5.3.10 and Postgresql 9.1.3.

All ideas are appreciated.

Answer 1

Look on ts_headline function ts_headline.

SELECT ts_headline('english',
  'The most common type of search
is to find all documents containing given query terms
and return them in order of their similarity to the
query.',
  to_tsquery('query & similarity'));
                        ts_headline                         
------------------------------------------------------------
 containing given <b>query</b> terms
 and return them in order of their <b>similarity</b> to the
 <b>query</b>.