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bug#6384: Teach rx explicitly numbered submatches
From: |
Lennart Borgman |
Subject: |
bug#6384: Teach rx explicitly numbered submatches |
Date: |
Thu, 10 Jun 2010 18:21:36 +0200 |
On Thu, Jun 10, 2010 at 5:51 PM, Juri Linkov <juri@jurta.org> wrote:
>> (submatch . (rx-submatch 1 nil)) ; SRE
>> + (submatch-n . (rx-submatch-n 2 nil))
>
> I think better would be to allow the existing subform `submatch'
> to support numbered groups, i.e. in addition to the current form
> `(submatch SEXP1 SEXP2 ...)' also support
> `(submatch N SEXP1 SEXP2 ...)' because the number is a parameter
> of normal groups.
>
> There are already subforms that support different number of integer
> arguments like `(repeat N SEXP)' and `(repeat N M SEXP)'. So the same
> could be done for `submatch' too.
I thought of that, but currently you can do
(rx (submatch 1 "str"))
Should perhaps 1 etc be disallowed as SEXP:s in rx? (I do not know how
to do it because I believe rx uses `read'.)