query: embed.html#SELECT ?Property_ ?Property_Label ?Property_Description ?format_as_a_regular_expression (lang(?format_as_a_regular_expression) as ?lang)
  WHERE 
  {
    
  	?Property_ p:P1552 ?constraint_statement .
  	?constraint_statement ps:P1552 wd:Q100884525 .
  	OPTIONAL {?constraint_statement pq:P8770 ?format_as_a_regular_expression .}
  
  	SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
  } 