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  1. a <- c("it is ZZ10ASDJN123 and ZZ100DD22")
  2. gsub("\\s*\\b[A-Za-z]{2}\\d{2}(?!\\d)\\w*", "", a, perl=TRUE)
  3. gsub("\\s*\\b[A-Za-z]{2}\\d{2}[A-Za-z_]\\w*\\b", "", a)
Success #stdin #stdout 0.21s 39436KB
stdin
Standard input is empty
stdout
[1] "it is and ZZ100DD22"
[1] "it is and ZZ100DD22"