Divide and Conquer looks a lot simpler. Also looks promising.

Thanks.

FYI, examples of the data interpretations:

abc@def@@ghi => abcXef@ghi
abc@def\@ghi => abcXef@ghi
abc\def\\ghi => abcXef\ghi
abc\def@\ghi => abcXef\ghi

where d represents any directive and X represents the result.