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  1. library(stringr)
  2. Times <- c("12h00","16h30","Afternoon","15h00","14h20","7h30","06h00")
  3. str_extract(Times, '[1-9]\\d*(?=h)')
Success #stdin #stdout 0.23s 42512KB
comments (?)
stdin 
Standard input is empty
stdout 
[1] "12" "16" NA   "15" "14" "7"  "6"
https://ideone.com/1oRllc
language:
R (R 3.5.2)
created:
4 years ago
visibility:
public

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