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  1. library(stringr)
  2. pattern <- "(?<=Levorotatory)(?:\\s*([SRI]|N/I)\\s*([^\\w\\s]*\\d*\\.?\\d+)){2}";
  3. x <- "Viscocity                      S   <=0.25        S   <=0.25 Levorotatory                      S      <=21        R      <=2.5 Giminal                    S      <=1        S      <=1"
  4. results <- str_match(x, pattern)[,-1]
  5. results
  6.  
Success #stdin #stdout 0.28s 42516KB
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[1] "R"     "<=2.5"
https://ideone.com/e8TTb0
language:
R (R 3.5.2)
created:
3 years ago
visibility:
secret

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