Convert accented characters into ascii character

Question

What is the optimal way to to remove German (or French) accents from a vector of 16 million string variables.

e.g., 'Sjögren's syndrome' into 'Sjogren's syndrome'

Converstion of single character into a single character is better then transliteration such as

ä => ae ö => oe ü => ue.

e.g., using regular expression would be one option but is there something better (R package for this)?

gsub('ü','u',gsub('ö','o',"Sjögren's syndrome ( über) "))

There are SO solutions for non-R platforms but not a good one for R.

Answer 1

One of the linked answers suggest

library(stringi)
stri_trans_general("Zażółć gęślą jaźń", "Latin-ASCII")

[1] "Zazolc gesla jazn"

Answer 2

Use iconv to convert to ASCII with transliteration (if supported):

iconv(c("über","Sjögren's"),to="ASCII//TRANSLIT")
[1] "uber"      "Sjogren's"