Re: start of line ?

[John]

>
> either a 'B', a 'C', or an 'E' at the start of a line, then anything, then a
> '$'.
>
> I'm thinking the only way to look for this in bison is to have flex return
> START_COMMENT when it finds a newline followed by a B, etc. so it would be
>

Flex knows when it is at the beginning of a line. Just use flex to
discard the comments:

        ^[ABC].*\n    /* discard */;