What led you to choose the ? operator for the FOLLOWED BY semantics?
It doesn't seem a terribly natural choice -- most other things seems to
use ? as some sort of wildcard.  What about something like "...", so you
would do
  SELECT q @@ to_tsquery('fatal ... error');
  SELECT q @@ (tsquery 'fatal' ... tsquery 'error');

Álvaro Herrera                http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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