How to make rsplit (like in Python) in D

[Uranuz via Digitalmars-d-learn]

How to make rsplit (like in Python) in D without need for extra 
allocation using standard library? And why there is no algorithms 
(or parameter in existing algorithms) to process range from the 
back. Is `back` and `popBack` somehow worse than `front` and 
`popFront`.

I've tried to write somethig that would work without allocation, 
but failed.
I have searching in forum. Found this thread:
https://forum.dlang.org/post/bug-10309-3@http.d.puremagic.com%2Fissues%2F

I tried to use `findSplitBefore` with `retro`, but it doesn't 
compile:

import std.stdio;
import std.algorithm;
import std.range;
import std.string;

void main()
{
	string str = "Human.Engineer.Programmer.DProgrammer";
	
	writeln( findSplitBefore(retro(str), ".")[0].retro );
}

Compilation output:
/d153/f534.d(10): Error: template std.range.retro cannot deduce 
function from argument types !()(Result), candidates are:
/opt/compilers/dmd2/include/std/range/package.d(198):        
std.range.retro(Range)(Range r) if 
(isBidirectionalRange!(Unqual!Range))


Why I have to write such strange things to do enough wide-spread 
operation. I using Python at the job and there is very much cases 
when I use rsplit. So it's very strange to me that D library has 
a lot of `advanced` algorithms that are not very commonly used, 
but there is no rsplit.

Maybe I missing something, so please give me some advice)