SQUALL to SPARQL Translator

Your SQUALL sentence:

Who are the parent-s of the spouse of 'Juan Carlos I'?

SELECT DISTINCT ?x1 WHERE {

?x2 :spouse ?x3 .
?x3 :parent ?x1 .
FILTER (REGEX(str(?x2),'Juan','i') && REGEX(str(?x2),'Carlos','i') && REGEX(str(?x2),'I','i')) .

}

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