Sparql：最后一个字符串

Question

Assuming I have some triples like this

:a ex:fileName "abc.txt".
:b ex:fileName "another.file.doc".

and assuming I want to create a SPARQL query that returns me the filename without a file extension? Like

"abc"
"another.file"

Does SPARQL have an easy way of doing something like "substring before last" ?

Answer 1

You can use REPLACE() with a matching regexp:

SELECT ?file ?filename
WHERE {
  ?file ex:fileName ?rawFilename .

  BIND( REPLACE( ?rawFilename , '\\.[^.]*$', '' ) AS ?filename )
}