-- DROP FUNCTION schema_xyz.city_cleaning_pg(text);

CREATE OR REPLACE FUNCTION schema_xyz.city_cleaning_pg(spalte_in text)
 RETURNS character varying
 LANGUAGE plpgsql
AS $function$

DECLARE


ergebnis varchar;
city_cleaned varchar;



BEGIN

   
city_cleaned:=regexp_replace(upper(spalte_in),'D?E?O?W?-? ?[0-9]{4,6} ?',' ' , 'g');
city_cleaned:=regexp_replace(city_cleaned,'D?E?O?W?-? ?[0-9]{2,2} [0-9]{3,3} ?',' ' , 'g');
city_cleaned:=regexp_replace(city_cleaned,'D?E?o?W?-? ?[0-9]{3,3} [0-9]{2,2} ?',' ' , 'g');
city_cleaned:=ltrim(rtrim(city_cleaned));
city_cleaned:=replace(city_cleaned,', ', ' ');
city_cleaned:=replace(city_cleaned,'  ', ' ');
city_cleaned:=replace(city_cleaned,'  ', ' ');

if (city_cleaned like '%,')
then
city_cleaned:=substr(city_cleaned, 1, length(city_cleaned)-1);
end if;

city_cleaned:=ltrim(rtrim(city_cleaned));
city_cleaned:=regexp_replace(city_cleaned,'^[0-9]{1,3} ',' ' , 'g');
city_cleaned:=regexp_replace(city_cleaned,' [0-9]{1,3}$',' ' , 'g');
city_cleaned:=regexp_replace(city_cleaned,' [0-9]{1,3} ',' ' , 'g');
city_cleaned:=replace(city_cleaned,', ', ' ');
city_cleaned:=replace(city_cleaned,'  ', ' ');
city_cleaned:=replace(city_cleaned,'  ', ' ');
city_cleaned:=ltrim(rtrim(city_cleaned));


 ergebnis:=city_cleaned;
   
   
   RETURN ergebnis;

	END;
$function$
;