Check Subdomein Got error 'empty (sub)expression' from regexp in SELECT id,sleutel,url,synoniemen,taalpar FROM subdomein WHERE ((kenmerk REGEXP 'ameland') ) AND ((sleutel regexp '(zuidergrie|knotswier||on|the|map!)') OR (synoniemen regexp '(zuidergrie|knotswier||on|the|map!)')) AND ((talen&1)>0) ORDER BY sleutel DESC;
Zuidergrie, Knotswier on the map onAmeland.com