With the right mental model, though, it can become intuitive. That is, keep in
mind that the R interpreter uses \ as a metacharacter, and so does the regex
library. You want to search for a \, which regex thinks is special, so you have
to escape it for regex functions (\\). Then, because R thinks \ is special, you
have to escape each of those ("\\\\") in your source file to get a pair of
backslashes in memory to give to regex functions.
To practice, always think of an opening quote mark as an opportunity watch for
backslashes and mentally remove the first one and change the following
character to whatever it should be to picture what is in memory. Use the print
function to see how R wants you to toe it in, and use the cat function to see
how it looks in memory.
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DCN:<jdnew...@dcn.davis.ca.us> Basics: ##.#. ##.#. Live Go...
Live: OO#.. Dead: OO#.. Playing
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Sent from my phone. Please excuse my brevity.
On June 3, 2014 11:18:14 AM PDT, Sarah Goslee <sarah.gos...@gmail.com> wrote:
>Hi,
>
>R uses \ as a metacharacter, so you need a non-intuitive number of \:
>
>
>mystring <- "Man\\Woman"
># \\ is a metacharacter and a \, so it's equivalent to \ in normal text
>sub("\\\\", "/", mystring)
>
>
>Sarah
>
>
>On Tue, Jun 3, 2014 at 2:03 PM, Adrian Dușa <dusa.adr...@unibuc.ro>
>wrote:
>> Dear All,
>>
>> I should be knowing this, but not get it right... For a string like
>this:
>>
>> "Man\Woman"
>>
>> I would like to detect the escape character "\" and replace it with
>"/".
>>
>> Tried various ways using gsub(), but don't get it right yet. Any
>suggestion
>> would be highly welcomed...
>>
>> Thank you,
>> Adrian
>>
>
>--
>Sarah Goslee
>http://www.functionaldiversity.org
>
>______________________________________________
>R-help@r-project.org 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.
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