regular expression which contains backslash.
--------+---------
(0 rows)
+--backslash is used in tests below, installcheck will fail if
+--standard_conforming_string is off
+set standard_conforming_strings=on;
select show_trgm('');
show_trgm
-----------
FROM pg_opclass opc LEFT JOIN pg_am am ON am.oid = opcmethod
WHERE opc.oid >= 16384 AND NOT amvalidate(opc.oid);
+--backslash is used in tests below, installcheck will fail if
+--standard_conforming_string is off
+set standard_conforming_strings=on;
+
select show_trgm('');
select show_trgm('(*&^$@%@');
select show_trgm('a b c');