Concatenating/inserting strings with backslashes

[Brian Julin]

> Brian Candler wrote
> 
> > try:
> >
> > if (%{reply:Reply-Message} =~ /(.*)/) {
> >    update reply {
> >          Reply-Message = "stuff %{1}"
> >    }
> > }
> 
> Nice idea, but it appears to suffer the same expansion problem.
> 
> As you have written it gives this error:
> 
>   Bare %{...} is invalid in condition at: %{reply:Reply-Message} =~ /(.*)/)
> 
> Adding the double quotes:

Oh right.

I usually do this with e.g. User-Name without having to specify the attribute list
explicitly; I forget whether syntax works to do that with a raw variable.
I know outer.VarName works raw, so maybe just reply:Reply-Message
without the braces or quotes?