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  1. library(stringr)
  2.  
  3. x <- c('123456789', 'kfasdf  3456789asdf', 'a        1')
  4. y <- c('12345 789', '1       9', 'a     678a')
  5.  
  6. str_extract(x, regex('(?=[ \\d]{9}(.*$))[ ]*\\d+\\1$'))
  7. str_extract(y, regex('(?=[ \\d]{9}(.*$))[ ]*\\d+\\1$'))
Success #stdin #stdout 0.24s 42652KB
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[1] "123456789"     "  3456789asdf" "        1"    
[1] NA NA NA
https://ideone.com/20Q11B
language:
R (R 3.5.2)
created:
5 years ago
visibility:
public

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