Commented Unassigned: Parsing a backslash [12206]

I'm building a lexer to parse Zinc and MiniZinc files. In these files the wedge (/\) and vee (\/) are represented by slashes and backslashes. The lexer however reports in the case of \/ this as an "OTHER" and "OPDIV" character. I tried solving this problem by replacing \\ by the hexadecimal code of a backslash, but this method failed to give the correct result. I can't find anything in the manual describing this problem. Is it a bug or dit I do something wrong?
Comments: ** Comment from web user: talweiss1982 **

I'm having the same issue when using unicode mode.
It seems GPLEX is ignoring '\'
If you have found a solution for this problem please email me at tal@ayende.com