Split a string

Usage

str_split_one(string, pattern, n = Inf)

Arguments

string

A character vector with, at most, one element.

pattern

Pattern to look for.

The default interpretation is a regular expression, as described in vignette("regular-expressions"). Use regex() for finer control of the matching behaviour.

Match a fixed string (i.e. by comparing only bytes), using fixed(). This is fast, but approximate. Generally, for matching human text, you'll want coll() which respects character matching rules for the specified locale.

Match character, word, line and sentence boundaries with boundary(). An empty pattern, "", is equivalent to boundary("character").

n

Maximum number of pieces to return. Default (Inf) uses all possible split positions.

For str_split(), this determines the maximum length of each element of the output. For str_split_fixed(), this determines the number of columns in the output; if an input is too short, the result will be padded with "".

Value

A character vector.

Examples

x <- "alfa,bravo,charlie,delta"
str_split_one(x, pattern = ",")
#> [1] "alfa"    "bravo"   "charlie" "delta"  
str_split_one(x, pattern = ",", n = 2)
#> [1] "alfa"                "bravo,charlie,delta"

y <- "192.168.0.1"
str_split_one(y, pattern = stringr::fixed("."))
#> [1] "192" "168" "0"   "1"