[R] regular expression
laurentRhelp at free.fr
Sat Apr 7 22:01:38 CEST 2007
Gabor Grothendieck a écrit :
>I assume is to replace single quotes in double quoted strings with single quoted
>strings containing double quotes in place of the single quotes
>double quoted strings not containing single quotes as they are (i.e. leave them
>as double quoted).
No, at the end, I have to replace all the double quotes (") by simple
> Is that right? In that case, try this:
>squote <- "'" # single quote. This is a double quote, single quote, double quote
>dquote <- '"' # double quote This is a single quote, double quote, single quote
>s <- "[\"...\" \"...'...\"]"
>f <- function(x) if (regexpr(squote, x) > 0)
> chartr(paste(squote, dquote), paste(dquote, squote), x) else x
>gsubfn('["][^"]*["]', f, s) # "[\"...\" '...\"...']"
>One could omit the first and last pair of  in the last line but I put them in
>On 4/6/07, Laurent Rhelp <laurentRhelp at free.fr> wrote:
>> 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 ?
>>Thank you very much
>>R-help at stat.math.ethz.ch mailing list
>>PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>>and provide commented, minimal, self-contained, reproducible code.
>R-help at stat.math.ethz.ch mailing list
>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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