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 '(ridderspoor||reserve!)') OR (synoniemen regexp '(ridderspoor||reserve!)')) AND ((talen&1)>0) ORDER BY sleutel DESC;
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