On Thu, 16 Jan 2020 at 14:34, Wietse Venema <[email protected]> wrote:
> Dominic Raferd:
> > Thanks Christian that was very helpful. I have it working now for
> > postscreen and I think (but am waiting for an incoming instance) for
> > smtpd. Weird
> > that they have such different approaches (postscreen_dnsbl_reply_map and
> > rbl_reply_maps). And I could not find a way to use pcre with
> rbl_reply_maps
> > because it throws a warning if I reference any variables such as
> $rbl_code
> > - but such variables do seem to work in a hash file.
>
> Use $$name instead of $name.
>
> As documented:
>
> TEXT SUBSTITUTION
> Substitution of substrings (text that matches patterns inside
> "()")
> from the matched expression into the result string is requested
> with
> $1, $2, etc.; specify $$ to produce a $ character as output.
> The
> macros in the result string may need to be written as ${n} or
> $(n) if
> they aren't followed by whitespace.
>
Thanks Wietse. I had read that but I interpreted the text 'specify $$ to
produce a $ character as output' as meaning that $$ would produce a
hard-coded dollar sign, not a sign that could then be re-interpreted as the
start of a variable. Perhaps the text could clarify this?
