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  1. sample <- c("abc def ghi WQE34324Wweasfsdfs23234", "abcd efgh WQWEQtWe_232")
  2. gsub("\\b(?=\\w*[a-z])(?=\\w*[A-Z])(?=\\w*\\d)\\w{8,}", "", sample, perl=TRUE) ## replace_alnum
  3. gsub("(?<!\\S)(?=\\S*[a-z])(?=\\S*[A-Z])(?=\\S*[0-9])(?=\\S*[_-])[A-Za-z0-9_-]{8,}", "", sample, perl=TRUE) ## replace_alnumsym
  4.  
Success #stdin #stdout 0.22s 60752KB
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stdin 
Standard input is empty
stdout 
[1] "abc def ghi " "abcd efgh "  
[1] "abc def ghi WQE34324Wweasfsdfs23234" "abcd efgh "
https://ideone.com/duFaJq
language:
R (R 3.5.2)
created:
8 years ago
visibility:
secret

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