Replace specific characters within strings

With a regular expression and the function gsub():

group <- c("12357e", "12575e", "197e18", "e18947")group[1] "12357e" "12575e" "197e18" "e18947"gsub("e", "", group)[1] "12357" "12575" "19718" "18947"

What gsub does here is to replace each occurrence of "e" with an empty string "".

See ?regexp or gsub for more help.

Regular expressions are your friends:

R> ## also adds missing ')' and sets column nameR> group<-data.frame(group=c("12357e", "12575e", "197e18", "e18947"))  )R> group   group1 12357e2 12575e3 197e184 e18947

Now use gsub() with the simplest possible replacement pattern: empty string:

R> group$groupNoE <- gsub("e", "", group$group)R> group   group groupNoE1 12357e    123572 12575e    125753 197e18    197184 e18947    18947R> 

Summarizing 2 ways to replace strings:

group<-data.frame(group=c("12357e", "12575e", "197e18", "e18947"))

1) Use gsub

group$group.no.e <- gsub("e", "", group$group)

2) Use the stringr package

group$group.no.e <- str_replace_all(group$group, "e", "")

Both will produce the desire output:

   group group.no.e1 12357e      123572 12575e      125753 197e18      197184 e18947      18947