Splitting a string on two zero-width assertions

Question

I would like to isolate a number within a string by splitting it on two zero-width assertions. I can split on the first

strsplit("nursereviewday36_arm_1", "(?<=[[:alpha:]])(?=[[:digit:]])", perl = T)

So that it returns

[[1]]
[1] "nursereviewday" "36_arm_1"  

But I would like to split into three like so

[[1]]
[1] "nursereviewday" "36" "_arm_1" 

This is in R but any regex that solves this will do

Answer 1

尝试这个：

 (?<=[[:alpha:]])(?=[[:digit:]])|(?<=[[:digit:]])(?=_)