fork(1) download 
  1. x <- c("FELON IN POSSESSION OF AMMUNITION (ACTUAL POSSESSION) (79023)",
  2. "FAIL TO DISPLAY REGISTRATION - POSSESSION REQUIRED (320.0605(1))")
  3. sub(".*(\\(((?:[^()]++|(?1))*)\\))$", "\\2", x, perl=TRUE)
Success #stdin #stdout 0.27s 39436KB
comments (?)
stdin 
Standard input is empty
stdout 
[1] "79023"       "320.0605(1)"
https://ideone.com/91zXW5
language:
R (R 3.5.2)
created:
3 years ago
visibility:
secret

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