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  1. x <- c("Set", "Set Value", "Set(Value)")
  2. grep('^Set(?:\\s+Value)?$', x, value=TRUE)
  3. grep('\\bSet(?!\\(Value\\))(?:\\s+Value)?\\b', x, perl=TRUE, value=TRUE)
Success #stdin #stdout 0.24s 39568KB
comments (?)
stdin 
Standard input is empty
stdout 
[1] "Set"       "Set Value"
[1] "Set"       "Set Value"
https://ideone.com/ldLmiZ
language:
R (R 3.5.2)
created:
4 years ago
visibility:
secret

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