PREFIX :
PREFIX xsd:
SELECT
?s
?str
(STRBEFORE(?str,"b") AS ?bb)
(STRBEFORE(?str,"bc") AS ?bbc)
(STRBEFORE(?str,"b"@cy) AS ?bbcy)
(STRBEFORE(?str,"") AS ?b)
(STRBEFORE(?str,""@en) AS ?ben)
(STRBEFORE(?str,"b"^^xsd:string) AS ?bbx)
(STRBEFORE(?str,"xyz"^^xsd:string) AS ?bxyzx)
WHERE {
?s :str ?str
}