R devel - Mar 2018 - reshape function: allow split argument to include perl

Hi,
I'd like to request that the "split" argument of the reshape
function include the perl
argument so that "splitting" is more flexible.

An example is if the varying argument contains "Q1.1.1, Q1.1.2, Q1.2.1,
Q1.2.2, " etc.
Splitting on the last "dot" seems to be only possible using perl.
> x <- c("Q1.1.1", "Q1.1.2", "Q1.2.1",
"Q1.2.2")
> strsplit(x, "(\\.)(?=[^\\.]$)", perl=TRUE)
[[1]]
[1] "Q1.1" "1"

[[2]]
[1] "Q1.1" "2"

[[3]]
[1] "Q1.2" "1"

[[4]]
[1] "Q1.2" "2"

Thanks.
-- 
Edward McNeil