title: PSQLException: ERROR: syntax error in tsquery
body: <p>Which characters must be avoided to make sure <em>PSQLException: ERROR: syntax error in tsquery</em> will not occur?
  The documentation does not say anything about how to escape the search string: <a href="http://www.postgresql.org/docs/8.3/static/datatype-textsearch.html" rel="noreferrer">http://www.postgresql.org/docs/8.3/static/datatype-textsearch.html</a></p>