CODEWITHSUNDEEP
rgsub
Optimus
Optimus

Reputation: 1624

Remove hyphen at the end of string in R

I have a column of a dataframe in R like this:

names <- data.frame(name=c("ABC", "ABC-D", "ABCD-"))

I would like to remove the hyphen at the end of the strings while maintaining the hyphen in the middle of them. I've tried a few expressions like:

names$name <- gsub("+-\\w", "", names$name)
# the desired output is "ABC", "ABC-D", and "ABCD", respectively

While several combinations remove the hyphens entirely, I'm not sure how to specify the string boundary and the hyphen together.

Thanks!

Upvotes: 1

Views: 3609

Answers (1)

Cath
Cath

Reputation: 24074

Try :

gsub("\\-$", "", names$name)
# [1] "ABC"   "ABC-D" "ABCD"

$ tells R that the (escaped) hyphen is at the end of the word

Although, as the - is placed first in the regex you don't need to escape it so this works too:

gsub("-$", "", names$name)
#[1] "ABC"   "ABC-D" "ABCD"

Upvotes: 2

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