[R] regular expression

[Laurent Rhelp]

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 
>
that's rignt

>while leaving
>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 
quote (')

>  Is that right?  In that case, try this:
>
>library(gsubfn)
>
>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
>for readability.
>
>On 4/6/07, Laurent Rhelp <laurentRhelp at free.fr> 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 ?
>>
>>Thank you very much
>>
>>______________________________________________
>>R-help at 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.
>>
>>    
>>
>
>______________________________________________
>R-help at 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.
>
>
>  
>