SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function countMatchesCaseInsensitive (children 1)
     ExpressionList (children 2)
      Literal \'foo.com@foo.com bar.com@foo.com BAZ.com@foo.com bam.com@foo.com\'
      Literal \'([^. ]+)\\\\.([^. ]+)@([^. ]+)\\\\.([^. ]+)\'