Splitting a character vector.
Just to clarify, the regex engine wants to see a \ before the ( if it is to treat it as an ordinary character. However, the source code interpreter also treats \ as an escape character. In order to get a \ into the string, you have to escape it. So it takes two \ characters in source code to obtain one \ character in memory where the regex code can "see" it.
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Rui Barradas <ruipbarradas at sapo.pt> wrote:
Hello,
Try the following.
open.par <- " \\(" # with a blank before '('
close.par <- "\\)"
result <- strsplit(sub(close.par, "", dd1), open.par)
Why the two '\\'? Because '(' is a meta-character so it must be
escaped.
But '\' is a meta character so it must also be escaped.
Then choose the right way to separate the two, maybe something like
ix <- rep(c(TRUE, FALSE), length(result))
unlist(result)[ix]
unlist(result)[!ix]
Hope this helps,
Rui Barradas
Em 07-07-2012 22:37, John Kane escreveu:
I am lousy at simple regex and I have not found a solution to a
simple problem.
I have a vector with some character values that I want to split. Sample data dd1 <- c( "XXY (mat harry)","XXY (jim bob)", "CAMP (joe blow)",
"ALP (max jack)")
Desired result
dd2 <- data.frame( xx = c("XXY", "XXY", "CAMP", "ALP"), yy = c("mat
harry", "jim bob" , "joe blow", "max jack"))
I thought I should be able to split the characters with strsplit but
either I am misunderstanding the function or don't know how to escape a
"(" properly in an effort to at least get "XXY" "(mat harry)"
Any pointers would be appreciated Thanks John Kane Kingston ON Canada
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