fork(1) download 
  1. x <- c('SEF001DT45','BV004MF')
  2. library(stringr)
  3. results <- stringr::str_match(x, '[A-Z]{2}.*?([A-Z]{2})')
  4. results[,2]
Success #stdin #stdout 0.29s 42032KB
comments (?)
stdin 
Standard input is empty
stdout 
[1] "DT" "MF"
https://ideone.com/D9rrcK
language:
R (R 3.5.2)
created:
3 years ago
visibility:
secret

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