Try this:
text <- 'var1 var2
1 ab_c_(ok)
2 okf789(db)_c
3 jojfiod(90).gt
4 "ij"_(78)__op
5 (iojfodjfo)_ab'
df <- read.table(textConnection(text), head=T, sep=" ",quote="")
df$var3 <- gsub("(.*\\()(.*)(\\).*)","\\2",df$var2)
-----
A R learner.
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