file = "./Light Novels/Isekai/Tsuki ga Michibiku Isekai Douchuu, Chapter 0_ Prologue - Chapter 199 (66)/Tsuki ga Michibiku Isekai Douchuu, Chapter - Azumi Kei.txt"

local H = io.open(file)
local S = H:read"a"
H:close()
print"READ FILE"

local start, lastword, fin = S:match"()(%w+)()%W+$"
print(lastword)
fin = fin-1

local bench = require'bucket.misc.benchmark'

local function straightmatch() return S:match"(%w+)%W+$" end
local function subfirst() return S:sub(start,fin) end
local function reverse() S:reverse() end -- just reverse
local function reverseit() return S:reverse():match"%w+":reverse() end

io.write"reverseit: " bench.Benchmark_once_portable(true, reverseit)
io.write"reverse(): " bench.Benchmark_once_portable(true, reverse)
io.write"straightmatch: " bench.Benchmark_once_portable(true, straightmatch)
io.write"subfirst: " bench.Benchmark_once_portable(true, subfirst)


--[[ Results:
reverseit: Clock:         0.017444
straightmatch: Clock:   1.390177
subfirst: Clock:        2.9999999999752e-06
3.05user
0.03system
0:03.09elapsed
99%CPU
(0avgtext+0avgdata 25160maxresident)k
0inputs+0outputs (0major+7584minor)pagefaults
0swaps

So sub is the slowest! idk why
straightmatch is fast, but that's because its a good pattern
a bad pattern though? looped for a long time (almost a minute)
So reversing is great, but I imagine utf8 would really mess it up
--]]