s1 should use \\ like this:
s1<-
"C:\\Rtools\\bin;C:\\Rtools\\perl\\bin;C:\\Rtools\\MinGW\\bin;C:\\Program\\MiKTeX
2.7\\miktex\bin"
Also 1. you won't need to change your path in the first place if you use
the batchfiles at http://batchfiles.googlecode.com
2. there is also a free path editor discussed there. See Q4 or Q8
in the troubleshooting faq on that same page.
On Mon, Aug 17, 2009 at 3:21 AM, ravi<rv15i at yahoo.se>
wrote:> Hi R-users and R-experts,
> I am having a hard time in figuring out how to tackle regex questions where
the "backslash" character is an integral part of the string. Let me
explain how I?came across?this problem :
> I wanted to clearly see all the components in the windows environmental
path variable. This is a long string.?For easy readability, I wanted to split up
this string so that each component starts on a new line. But I?ran smack into a
problem in the very first step -?in reading in the string. Look at the following
code :
>
> ##### path variable has been shortened to show only the first few
components
> s1<-
"C:\Rtools\bin;C:\Rtools\perl\bin;C:\Rtools\MinGW\bin;C:\Program\MiKTeX
2.7\miktex\bin;"
> s2<-gsub(";",";\n",s1)
> cat(s2,"\n")
>
> I get the following warning messages after the first line :
> Warning messages:
> 1: '\R' is an unrecognized escape in a character string
> 2: '\R' is an unrecognized escape in a character string
> 3: '\p' is an unrecognized escape in a character string
> 4: '\R' is an unrecognized escape in a character string
> 5: '\M' is an unrecognized escape in a character string
> 6: '\P' is an unrecognized escape in a character string
> 7: '\M' is an unrecognized escape in a character string
> 8: '\m' is an unrecognized escape in a character string
> 9: unrecognized escapes removed from
"C:\Rtools\bin;C:\Rtools\perl\bin;C:\Rtools\MinGW\bin;C:\Program\MiKTeX
2.7\miktex\bin;"
>
> I thought about attempting to escape the escape character and so on. Is
that a?workable option here? However, for this to work, I must first be able to
read in the string correctly. The simplest solution, if it is at all
possible,?would be?to temporarily change the escape character. To "%",
for example. Is such a declaration possible? Other alternatives?
> I would appreciate help in understanding different ways of solving this
problem.
> Thanking you,
> Ravi
>
>
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