| strsplit {base} | R Documentation |
Split the elements of a character vector x into substrings
according to the presence of substring split within them.
strsplit(x, split, extended = TRUE)
x |
character vector, to be split. |
split |
character vector containing a regular expression to use
as “split”. If empty matches occur, in particular if split
has length 0, x is split into single characters. If
split has length greater than 1, it is re-cycled along x. |
extended |
if TRUE, extended regular expression matching
is used, and if FALSE basic regular expressions are used. |
Arguments x and split will be coerced to character, so
you will see uses with split=NULL to mean
split=character(0), including in the examples below.
Note that spltting into single characters can be done via
split=character(0) or split=""; the first is more efficient.
A list of length length(x) the i-th element of which
contains the vector of splits of x[i].
paste for the reverse,
grep and sub for string search and
manipulation; further nchar, substr.
regular expression for the details of the pattern specification.
noquote(strsplit("A text I want to display with spaces", NULL)[[1]])
x <- c(as = "asfef", qu = "qwerty", "yuiop[", "b", "stuff.blah.yech")
# split x on the letter e
strsplit(x,"e")
unlist(strsplit("a.b.c", "."))
## [1] "" "" "" "" ""
## Note that 'split' is a regexp!
## If you really want to split on '.', use
unlist(strsplit("a.b.c", "\\."))
## [1] "a" "b" "c"
## a useful function: rev() for strings
strReverse <- function(x)
sapply(lapply(strsplit(x,NULL), rev), paste, collapse="")
strReverse(c("abc", "Statistics"))
## get the first names of the members of R-core
a <- readLines(file.path(R.home(),"AUTHORS"))[-(1:8)]
a <- a[(0:2)-length(a)]
(a <- sub(" .*","", a))
# and reverse them
strReverse(a)