[I] perl operators in regular expressions [arrow]

["dhicks (via GitHub)" <gi...@apache.org>]

dhicks opened a new issue, #40220:
URL: https://github.com/apache/arrow/issues/40220

   ### Describe the enhancement requested
   
   R 4.3, arrow 14.0.0.2 (most recent Mac OS binary; apologies in advance if this is already supported in source)
   
   `arrow` can't handle perl operators, such as negative lookaheads, in regular expressions, at least via `dplyr` and `stringr`: 
   
   ```
   library(arrow)
   library(dplyr)
   library(stringr)
   
   ar = data.frame(text = c('Lorem ipsum dolor sit amet', 
                            'Lorem dolor ipsum sit amet')) |> 
       as_arrow_table()
   
   ## Works, returns both rows
   ar |> 
       filter(str_detect(text, 'Lorem [^(ipsum)]')) |> 
       collect()
   
   ## Should only return the second row
   ## Error in `compute.arrow_dplyr_query()`:
   ## ! Invalid: Invalid regular expression: invalid perl operator: (?!
   ar |> 
       filter(str_detect(text, regex('Lorem(?! ipsum)')))
       collect()
   ```
   
   ### Component(s)
   
   R


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Re: [I] [R] perl operators in regular expressions [arrow]

["assignUser (via GitHub)" <gi...@apache.org>]

assignUser commented on issue #40220:
URL: https://github.com/apache/arrow/issues/40220#issuecomment-1962436165

   Without looking at the code, so not a definitive answer, but I am pretty sure that `re2` the C++ library used in acero doesn't support lookahead so this is probably not something that can be added.


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