Overlapping matches in R

Question

I have searched and was able to find this forum discussion for achieving the effect of overlapping matches.

I also found the following SO question speaking of findin

Answer 1

An additional answer, based on @hwnd's own answer (the original didn't allow variable-length captured regions), using just built-in R functions:

> x <- 'ACCACCACCAC'
> m <- gregexpr('(?=([AC]C))', x, perl=T)[[1]]
> start <- attr(m,"capture.start")
> end <- attr(m,"capture.start") + attr(m,"capture.length") - 1
> sapply(seq_along(m), function(i) substr(x, start[i], end[i]))
[1] "AC" "CC" "AC" "CC" "AC" "CC" "AC"

Pretty ugly, which is why the stringr etc. packages exist.