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