fork download 
  1. string <- c("AB1C1", "AB2C2", "AB3C20")
  2. sub("(.*)(\\D\\d+)$", "\\1_\\2", string)
  3. ## => [1] "AB1_C1"  "AB2_C2"  "AB3_C20"
  4.  
Success #stdin #stdout 0.26s 38000KB
comments (?)
stdin 
Standard input is empty
stdout 
[1] "AB1_C1"  "AB2_C2"  "AB3_C20"
https://ideone.com/ll5cim
language:
R (R 3.5.2)
created:
4 years ago
visibility:
secret

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!