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  1. s <- c("ABC1.2", "22A.2", NA)
  2. gsub("[.][\\s\\S]*$", "", s, perl=T)
Success #stdin #stdout 0.46s 22816KB
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[1] "ABC1" "22A"  NA
https://ideone.com/8OZ9Iw
language:
R (R 3.5.2)
created:
10 years ago
visibility:
secret

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