PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX dc: <http://purl.org/dc/elements/1.1/>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>

# SELECT ?A foaf:name ?N
CONSTRUCT {
   ?A foaf:name ?N .
}
WHERE {
  # all things with "Jean" in its FOAF name
  ?A foaf:name ?N .
  FILTER regex( ?N, "Jean" )
}