Stringi

> install.packages("stringi")

  There is a binary version available but the source version is later:
        binary source needs_compilation
stringi  1.1.7  1.2.4              TRUE

  Binaries will be installed
trying URL 'https://cran.rstudio.com/bin/windows/contrib/3.5/stringi_1.1.7.zip'
Content type 'application/zip' length 14368013 bytes (13.7 MB)
downloaded 13.7 MB

package ‘stringi’ successfully unpacked and MD5 sums checked

The downloaded binary packages are in
	C:\Users\Paul\AppData\Local\Temp\Rtmpe8XQHS\downloaded_packages
> sessionInfo()
R version 3.5.1 (2018-07-02)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 7 x64 (build 7601) Service Pack 1

Matrix products: default

locale:
[1] LC_COLLATE=English_United States.1252  LC_CTYPE=English_United States.1252    LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C                           LC_TIME=English_United States.1252

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

loaded via a namespace (and not attached):
[1] compiler_3.5.1 tools_3.5.1    yaml_2.2.0
>