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  1. x <-  c('2020M6','2020M10')
  2. sub("(M)([0-9])$", "\\10\\2", x)
  3. sub("(M)([0-9])$", "\\10\\2", x, perl=TRUE)
  4.  
Success #stdin #stdout 0.25s 39604KB
comments (?)
stdin 
Standard input is empty
stdout 
[1] "2020M06" "2020M10"
[1] "2020M06" "2020M10"
https://ideone.com/zb2QfY
language:
R (R 3.5.2)
created:
5 years ago
visibility:
secret

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