strsplit {base}

R Documentation

Split the Elements of a Character Vector

Description

Split the elements of a character vector x into substrings according to the presence of substring split within them.

Usage

strsplit(x, split, extended = TRUE)

Arguments

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.

Value

A list of length length(x) the i-th element of which contains the vector of splits of x[i].

See Also

paste for the reverse, grep and sub for string search and manipulation; further nchar, substr.

Examples

noquote(strsplit("A text I want to display with spaces", NULL)[[1]])

x <- c("asfef", "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"))

a <- readLines(file.path(R.home(),"AUTHORS"))[-(1:8)]
a <- a[0:1-length(a)]
sub("\t.*","", a)
strReverse(sub(" .*","", a))

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