gsub

I have a list of strings which contain random characters such as: list=list() list[1] = "djud7+dg[a]hs667" list[2] = "7fd*hac11(5)" list[3] = "2tu,g7gka5" I'd like to know which numbers are present at least once ( unique() ) in this list. The solution of my example is: solution: c(7,667,11,5,2) If someone has a method that does not consider 11 as "eleven" but as "one and one", it would also be useful. The solution in this condition would be: solution: c(7,6,1,5,2) (I found this post on a related subject: Extracting numbers from vectors of strings ) For the second answer, you can use gsub to

I'm trying to replace characters in a data.frame. I have a solution for this > df <- data.frame(var1 = c("aabbcdefg", "aabbcdefg")) > df var1 1 aabbcdefg 2 aabbcdefg > df$var1 <- gsub("a", "h", df$var1) > df$var1 <- gsub("b", "i", df$var1) > df$var1 <- gsub("c", "j", df$var1) > df$var1 <- gsub("d", "k", df$var1) > df$var1 <- gsub("e", "l", df$var1) > df$var1 <- gsub("f", "m", df$var1) > df var1 1 hhiijklmg 2 hhiijklmg > but I would like to avoid using several gsub calls, it would be much nicer to produce a function to do this at once? Any ideas ho to proceed? You can create from and to vectors