Script with utf-8 text runs differently from RStudio and command line in Windows

Question

I'm working with files containing text in Hindi and parsing them. I wrote my code in Rstudio and executed it without many issues. But now, I need to execute the same script from command line using R.exe/Rscript.exe and it doesn't work the same way. I've run a simple script from both RStudio and the terminal:

n_p<-'नाम'

Encoding(n_p)

gregexpr(n_p,c('adfdafc','नाम adsfdfa'))
sessionInfo()

Output In RStudio:

> n_p<-'नाम'
> 
> Encoding(n_p)
[1] "UTF-8"
> 
> gregexpr(n_p,c('adfdafc','नाम adsfdfa'))
[[1]]
[1] -1
attr(,"match.length")
[1] -1

[[2]]
[1] 1
attr(,"match.length")
[1] 3

> sessionInfo()
R version 3.5.0 (2018-04-23)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 7 x64 (build 7600)

Matrix products: default

locale:
[1] LC_COLLATE=English_India.1252  LC_CTYPE=English_India.1252   
[3] LC_MONETARY=English_India.1252 LC_NUMERIC=C                  
[5] LC_TIME=English_India.1252    

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] rJava_0.9-10

loaded via a namespace (and not attached):
[1] compiler_3.5.0 tools_3.5.0   

Output with R.exe in cmd (For debugging purposes. Rscript.exe gives a similar if not identical output)

> n_p<-'à☼"à☼_à☼r'
>
> Encoding(n_p)
[1] "latin1"
>
> gregexpr(n_p,c('adfdafc','à☼"à☼_à☼r adsfdfa'))
[[1]]
[1] -1
attr(,"match.length")
[1] -1

[[2]]
[1] 1
attr(,"match.length")
[1] 9

> sessionInfo()
R version 3.5.0 (2018-04-23)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 7 x64 (build 7600)

Matrix products: default

locale:
[1] LC_COLLATE=English_India.1252  LC_CTYPE=English_India.1252
[3] LC_MONETARY=English_India.1252 LC_NUMERIC=C
[5] LC_TIME=English_India.1252

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

loaded via a namespace (and not attached):
[1] compiler_3.5.0

I've tried changing locales but Sys.setlocale refuses to work properly. In some cases, gregexpr gives an error when it can't parse non ASCII code. And finally, when it does run without errors, it doesn't match regular expressions properly. I can't provide a reproducible example at the moment, but I will try to later.

Help.

Answer 1

The right answer is that you should run Rscript with the option --encoding=file encoding

There is no need to set locale, and as you probably found out, it doesn't work anyway. If your file is UTF-8: Rscript.exe --encoding=UTF-8 file.R