df <- data.frame(name=c("Hans", "Dieter", "Peter"), age=c(25,26,27))dfdf[] <- lapply(df, gsub, pattern='a', replacement="e")df
Standard input is empty
name age 1 Hans 25 2 Dieter 26 3 Peter 27 name age 1 Hens 25 2 Dieter 26 3 Peter 27
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