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  1. Data <- c("Posted by ondrej on 29 Feb 2020."
  2. , "Posted by ona'je on 29feb 2020")
  3.  
  4. sub(" +?on.*$", "", Data)  # "Posted by ondrej" "Posted by ona'je"
  5. sub(" +?on.*", "", Data)   # "Posted bydrej on 29 Feb 2020." "Posted bya'je on 29feb 2020"
  6. sub(" +?on(.*)", "", Data) # as expected
  7. sub(" +on.*", "", Data)    # as expected
  8.  
  9.  
Success #stdin #stdout 0.22s 39208KB
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stdin
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Standard input is empty
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[1] "Posted by ondrej" "Posted by ona'je"
[1] "Posted bydrej on 29 Feb 2020." "Posted bya'je on 29feb 2020"  
[1] "Posted by" "Posted by"
[1] "Posted by" "Posted by"
https://ideone.com/sZ6Laq
language:
R (R 3.5.2)
created:
3 years ago
visibility:
secret

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