Stefan Monnier <monnier@iro.umontreal.ca> writes:

> FWIW, I find it's cumbersome in RX to define regexps piecewise.
> E.g. with strings I can do things like:
>
>     (let* ((word-re "\\(?:\\sw\\|s_\\)+")
>            (spc-re "[ \t\n]*")
>            (re1 (concat spc-re "\\(" word-re "\\)" spc-re))
>            (re2 (concat spc-re "\\(" word-re "\\)(" word-re))))
>
> but do the same with RX you need something like:
>
>     (let* ((word-re (rx ...))
>            (spc-re (rx ...))
>            (re1 (rx-to-string `(... ,spc-re ... ,word-re ...)))
>            (re2 (rx-to-string `(... ,spc-re ... ,word-re ...))))
>
> I think `rx` would benefit from allowing to refer to variables.

Not sure what you are trying to do, but doesn't it work with

	(rx (... (eval VARIABLE) ...))

?

--
Pierre Neidhardt