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

Vectorised over string and pattern.

str_starts(string, pattern, negate = FALSE)

str_ends(string, pattern, negate = FALSE)

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.

Value

A logical vector.

See also

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

Examples

fruit <- c("apple", "banana", "pear", "pinapple")
str_starts(fruit, "p")
#> [1] FALSE FALSE  TRUE  TRUE
str_starts(fruit, "p", negate = TRUE)
#> [1]  TRUE  TRUE FALSE FALSE
str_ends(fruit, "e")
#> [1]  TRUE FALSE FALSE  TRUE
str_ends(fruit, "e", negate = TRUE)
#> [1] FALSE  TRUE  TRUE FALSE