code: def infer_namespaces(ac):
      
      return [v for k, v in ac_namespace_regexps.items() if k.match(ac)]
docs: infer possible namespaces of given accession based on syntax
      Always returns a list, possibly empty
  
      >>> infer_namespaces("ENST00000530893.6")
      ['ensembl']
      >>> infer_namespaces("ENST00000530893")
      ['ensembl']
      >>> infer_namespaces("ENSQ00000530893")
      []
      >>> infer_namespaces("NM_01234")
      ['refseq']
      >>> infer_namespaces("NM_01234.5")
      ['refseq']
      >>> infer_namespaces("NQ_01234.5")
      []
      >>> infer_namespaces("A2BC19")
      ['uniprot']
      >>> sorted(infer_namespaces("P12345"))
      ['insdc', 'uniprot']
      >>> infer_namespaces("A0A022YWF9")
      ['uniprot']