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  1. data <- c("DETROIT","DETROIT USA","DETROIT UNITED STATES")
  2. keep <- c("USA","UNITED STATES")
  3.  
  4. regex <- paste0(".*\\s*\\b(",paste0(keep,collapse="|"), ")\\b")
  5. sub(regex, "\\1", data)
  6.  
Success #stdin #stdout 0.25s 39420KB
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[1] "DETROIT"       "USA"           "UNITED STATES"
https://ideone.com/fUEmBc
language:
R (R 3.5.2)
created:
3 years ago
visibility:
public

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