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

In csdaw/stringrb: A Base R Version of 'stringr'

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

Description

Vectorised over string and pattern, though using vectorised patterns is relatively slow compared to stringr.

Usage

str_starts(string, pattern, negate = FALSE)

str_ends(string, pattern, negate = FALSE)

Arguments

string	character vector of strings.
pattern	character, a pattern with which the string should start or end. Can be: A Perl-compatible regular expression (default). Wrap with perl(ignore_case = TRUE) to use case-insensitive matching. Wrap with fixed() to use a fixed/literal match. Wrap with regex() to use a POSIX 1003.2 extended regular expression. Wrap with regex(ignore_case = TRUE) to use case-insensitive matching with a POSIX 1003.2 extended regular expression.
negate	logical, if TRUE return non-matching elements. Default is FALSE.

Value

Returns a logical vector the same length as string.

See Also

str_detect() which this function wraps.

Examples

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

csdaw/stringrb documentation built on Aug. 13, 2022, 10:55 p.m.