Is it possible (and if yes, of course, and how) to use Greek letters within lstlisting (of the listings package)? \epsilon, for instance, puts of course exactly that and not a Greek epsilon.
I have read in the documentation that it is possible to write e.g. Greek comments, but that is not what I want to do. I'm using lstlisting to write EBNF and would like to use an \epsilon for "empty".
