 string'));
                    strip
        --------------------------------
         'use' 'first' 'today' 'string'

</pre>
<p>If you wish to know the number of unique words returned in the
tsvector you can do so by using the function "length(tsvector)"</p>
<pre>
        SELECT length(to_tsvector('default',
                      'Our first string used today first string'));
         length
        --------
              4
        (1 row)
</pre>
<p>Lets take a look at the function to_tsquery. It also has 