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  1. library(stringr)
  2. my_string <- "\r\nContent: base64\r\n\r\nDBhHB\r\nDGlV\r\nPAAHJ\r\nAwQU\r\n"
  3. pat <- "(?m)^\\S+(?:\\R\\S+)*$"
  4. unlist(str_extract_all(my_string, pat))
  5. ## => [1] "DBhHB\r\nDGlV\r\nPAAHJ\r\nAwQU"
  6.  
  7. my_string <- "\r\nNot This\r\n\r\nKeepThis\r\nKeepThis\r\nNot This\r\nKeepThis\r\n"
  8. unlist(str_extract_all(my_string, pat))
  9. ## => [1] "KeepThis\r\nKeepThis" "KeepThis"
Success #stdin #stdout 0.24s 42336KB
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stdin
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stdout
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[1] "DBhHB\r\nDGlV\r\nPAAHJ\r\nAwQU"
[1] "KeepThis\r\nKeepThis" "KeepThis"
https://ideone.com/jBRzuw
language:
R (R 3.5.2)
created:
5 years ago
visibility:
secret

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