fork(1) download 
  1. text100 <- "My number#number # ## #number number# is 1234"
  2. gsub("(?<!\\w|#)[#](?!\\w|#)", "hash", text100, perl=T)
  3.  
Success #stdin #stdout 0.29s 22832KB
comments (?)
stdin 
Standard input is empty
stdout 
[1] "My number#number hash ## #number number# is 1234"
https://ideone.com/VRQ1WA
language:
R (R 3.5.2)
created:
10 years ago
visibility:
secret

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