string <- "this is \u00e4 string"
print(string)
print(convert_umlauts_to_ascii(string))
string <- "this is \u00e4 string"
df <- data.frame(v1 = c(string, "foobar"),
v2 = c("foobar", string), v3 = 3:4)
names(df)[3] <- "y\u00dfy"
convert_umlauts_to_ascii(df)
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