Vectorised over string
and pattern
.
Actually equivalent to grepl(pattern, x)
as returns FALSE
for NA
s (unlike stringr::str_detect()
).
This behavior is useful when searching comments many of which are NA to
indicate no comments present.
str_detect2(string, pattern, negate = FALSE)
Input vector. Either a character vector, or something coercible to one.
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")
.
If TRUE
, return non-matching elements.
A logical vector the same length as string
/pattern
.
x <- c("b", NA, "ab")
pattern <- "^a"
grepl(pattern, x)
#> [1] FALSE FALSE TRUE
stringr::str_detect(x, pattern)
#> [1] FALSE NA TRUE
str_detect2(x, pattern)
#> [1] FALSE FALSE TRUE