[R] replace last 3 characters of string

Bert Jacobs bert.jacobs at figurestofacts.be
Mon Apr 4 01:48:00 CEST 2011

I could imagine it was so simple.:)

-----Original Message-----
From: Dirk Eddelbuettel [mailto:edd at master.debian.org] On Behalf Of Dirk
Sent: 04 April 2011 01:39
To: Bert Jacobs
Cc: r-help at r-project.org
Subject: Re: [R] replace last 3 characters of string

On Mon, Apr 04, 2011 at 01:39:34AM +0200, Bert Jacobs wrote:
> I would like to replace the last tree characters of the values of a
> column in a dataframe.
> This replacement should only take place if the last three characters
> correspond to the value "/:/" and they should be replaced with ""(blank)
> I cannot perform a simple gsub because the characters /:/ might also be
> present somewhere else in the string values and then they should not be
> replaced.

Keep reading up on regular expressions, this tends to pay off. Here we
use the fact that you can achor a regexp to the end of a string:

R> aString <- "abc:def:::"
R> gsub(":::$", "", aString)
[1] "abc:def"

Hth, Dirk

Three out of two people have difficulties with fractions.

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