I was told to re-raise this issue with R-dev:
In the documentation of R-dev and R-3.4.3, under ?gsub
> replacement
> ... For perl = TRUE only, it can also contain "\U" or "\L" to convert the
> rest of the replacement to upper or lower case and "\E" to end case
> conversion.
However, the following code runs differently:
tempf <- tempfile()
writeLines(enc2utf8("author: Amélie"), con = tempf, useBytes = TRUE)
entry <- readLines(tempf, encoding = "UTF-8")
gsub("(\\w)", "\\U\\1", entry, perl = TRUE)
"AUTHOR: AMÉLIE" # R-3.4.3
"A" # R-dev
Best,
Hugh Parsonage.
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