This enforces one-or-more character matches in the regular expressions
for pg_dump testing on SQL syntax output where zero-or-more matches
implies a syntax error.

Author: Daniel Gustafsson
Reviewed-by: David G. Johnston, Michael Paquier
Discussion: https://postgr.es/m/B313C32C-0E24-4AFB-95FF-6DA0C4E18A89@yesql.se