Re: [R] regular expression

From: Uwe Ligges <ligges_at_statistik.uni-dortmund.de>
Date: Fri 06 Apr 2007 - 19:52:12 GMT

Laurent Rhelp wrote:
> Dear R-List,
>
> I have a great many files in a directory and I would like to
> replace in every file the character " by the character ' and in the same
> time, I have to change ' by '' (i.e. the character ' twice and not the
> unique character ") when the character ' is embodied in "....."
> So, "....." becomes '.....' and ".....'......" becomes '.....''......'
> Certainly, regular expression could help me but I am not able to use it.
>
> How can I do that with R ?

In fact, you do not need to know anything about regular expressions in this case, since you are simply going to replace certain characters by others without any fuzzy restrictions:

x <- "\".....'......\""
cat(x, "\n")
xn <- gsub('"', "'", gsub("'", "''", x)) cat(xn, "\n")

Uwe Ligges

> Thank you very much
>
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R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Sat Apr 07 06:01:18 2007

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