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  1. library(stringr)
  2. text = "123-4567-C-4321-DD.xxxx"
  3. pattern = "(?i)(?<=-[CP]-)[0-9]{4}"
  4. print(str_match(text, pattern)[,1])
Success #stdin #stdout 0.21s 190528KB
comments (?)
stdin 
Standard input is empty
stdout 
[1] "4321"
https://ideone.com/cj3sS1
language:
R (R 3.5.2)
created:
6 years ago
visibility:
public

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