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  1. library(stringr)
  2. x <- "[('one', 'CARDINAL'), ('Castro', 'PERSON'), ('Latin America', 'LOC'), ('Somoza', 'PERSON')]"
  3. str_extract_all(x, "\\([^()]*'LOC'[^()]*\\)")
  4. # => [1] "('Latin America', 'LOC')"
  5. str_extract_all(x, "[^']+(?=',\\s*'LOC'\\))")
  6. # => [1] "Latin America"
Success #stdin #stdout 0.27s 41784KB
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[[1]]
[1] "('Latin America', 'LOC')"

[[1]]
[1] "Latin America"
https://ideone.com/RF8ZYt
language:
R (R 3.5.2)
created:
2 years ago
visibility:
public

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