SPARQL supported filters

[cr3a7ure]

I'd like to ask which FILTER's are supported in rdflib.js SPARQL engine.
Actually it seems that FILTER is supported but how should one check it?
I mean regex() or logical operators ?

var sparQ2 = prefix +
            'SELECT \ ' +
            'WHERE { \
              ?who schema:domainIncludes schema:Airport . \
              FILTER { regex(?who,"^bbb") } . \
            } ';

  kb.add('bbb',SCHEMA('domainIncludes'),SCHEMA('Airport'));
  kb.add('aaa',SCHEMA('domainIncludes'),SCHEMA('Airport'));