PREFIX u: <http://www.w3.org/2004/12/q/idsyntax#>
SELECT DISTINCT *
WHERE {
  ?id a u:ID .
  ?id u:full ?full .
  ?id u:nameFor ?res .
  ?id u:scheme ?scheme .
  ?id u:authority ?authority .
  OPTIONAL { ?id u:userinfo ?userinfo } .
  OPTIONAL { ?id u:host ?host } .
  OPTIONAL { ?id u:port ?port } .
  OPTIONAL { ?id u:path ?path } .
  OPTIONAL { ?id u:query ?query } .
  OPTIONAL { ?id u:fragment ?fragment } . 
#  FILTER regex ( ?scheme, "http" ) . # schemes matching "http" ie. 
includes https:
#  FILTER regex ( ?scheme, "^http$" ) . # http: scheme
#  FILTER regex ( ?scheme, "^HTTP$" ) . # HTTP: scheme (do we normalise 
in the regex or the rdf?)
#  FILTER regex ( ?scheme, "^http$", "i" ) . # http: scheme, case 
insensitive (more robust)
# FILTER regex(?scheme,"^http$","i")  && ( (?port = "8080") || (?port = 
"1234") ).
#FILTER regex(?userinfo, ":") # password is given in the URI
FILTER regex(?host, "^pics|www\.pics") .
}