stringr (version 1.4.0)

str_starts: Detect the presence or absence of a pattern at the beginning or end of a string.

Description

Vectorised over string and pattern.

Usage

str_starts(string, pattern, negate = FALSE)
str_ends(string, pattern, negate = FALSE)

Value

A logical vector.

Arguments

string

Input vector. Either a character vector, or something coercible to one.

pattern

Pattern with which the string starts or ends.

The default interpretation is a regular expression, as described in stringi::stringi-search-regex. Control options with regex().

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.

negate

If TRUE, return non-matching elements.

See Also

str_detect() which this function wraps when pattern is regex.

Examples

fruit <- c("apple", "banana", "pear", "pinapple")
str_starts(fruit, "p")
str_starts(fruit, "p", negate = TRUE)
str_ends(fruit, "e")
str_ends(fruit, "e", negate = TRUE)