The start or end of a string.
START matches the start of a string.
END matches the end of a string.
exactly makes the regular expression match the whole string, from
start to end.
START END exactly(x)
x |
A character vector. |
An object of class regex (inherits from character) of length 1.
A character vector representing part or all of a regular expression.
Caret and dollar are used as start/end delimiters, since \A and
\Z are not supported by R's internal PRCE engine or stringi's
ICU engine.
START
END
# Usage
x <- c("catfish", "tomcat", "cat")
(rx_start <- START %R% "cat")
(rx_end <- "cat" %R% END)
(rx_exact <- exactly("cat"))
stringi::stri_detect_regex(x, rx_start)
stringi::stri_detect_regex(x, rx_end)
stringi::stri_detect_regex(x, rx_exact)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.