Re: Question about some fields in regex's re_pattern_buffer

[Karl Berry]

    re_set_registers is not documented; there's a note about this. I'd be
    happy to write some documentation for that. 

I see no reason not to.  I don't know why we never got to it.

    There's also the technique of re-using a registers data structure by
    NOT re_compile_fastmap, but using the fastmap member of the struct
    directly.

If it still actually works in the current code.

    Finally, there's the problem of the non-thread-safety of RE_NO_SUB
    which Paolo mentioned; again, I can document that if we're not going
    to solve it immediately.

I defer to Paolo on that one.

Thanks much,
karl