SQL: Word Count for a Column

Assuming I have a database with a posts table:

> select * from posts where id = 1;
 id |  title   |              content
----+----------+------------------------------------
  1 | My Title | This is the content of my article.

I can compute the word count of the content of a given post like so:

> select sum(array_length(regexp_split_to_array(content, '\s+'), 1)) from posts \
  where id = 1;
 sum
-----
   7

Via jbranchaud/til.