Index: database.sql
==================================================================
--- database.sql
+++ database.sql
@@ -134,15 +134,15 @@
 	LANGUAGE sql immutable STRICT
 	AS $$
 select mark(get_site($1), $2) as result;
 $$;
 
--- this function sets tags for site/regexp pair
+-- this function sets tags for site without regexp
 CREATE or replace FUNCTION set(my_id_site integer, my_id_tag integer) RETURNS integer
 	LANGUAGE sql STRICT
 	AS $$
-delete from urls where $1 = id_site and regexp is null;
+delete from urls where $1 = id_site and regexp is NULL;
 insert into urls (id_site, id_tag) values ($1, $2);
 select $1;
 $$;
 
 -- this function sets tags for site/regexp pair

Index: st-load.py
==================================================================
--- st-load.py
+++ st-load.py
@@ -37,19 +37,23 @@
 				config['host'],
 				config['database'],
 		) )
 
 	def load(self, csv_data):
-		insert = self._db.prepare("select set($1, $2, $3)")
 		with self._db.xact():
 			config.section('loader')
 			if config['drop_database']:
 				self._db.execute('delete from urls;')
 				if config['drop_site']:
 					self._db.execute('delete from site;');
+			insertreg = self._db.prepare("select set($1, $2, $3)")
+			insert = self._db.prepare("select set($1, $2)")
 			for row in csv_data:
-				insert(row[0], row[1], row[2])
+				if len(row[2]) > 0:
+					insertreg(row[0], row[1], row[2])
+				else:
+					insert(row[0], row[1])
 		self._db.execute('vacuum analyze site;')
 		self._db.execute('vacuum analyze urls;')
 
 # this classes processes config file and substitutes default values
 class Config: