Description Usage Arguments Details Value See Also Examples
str_subset()
is a wrapper around x[str_detect(x, pattern)]
,
and is equivalent to grep(pattern, x, value = TRUE)
.
str_which()
is a wrapper around which(str_detect(x, pattern))
,
and is equivalent to grep(pattern, x)
.
See str_detect()
for an equivalent to grepl(pattern, x)
.
1 2 3 |
string |
Input vector. Either a character vector, or something coercible to one. |
pattern |
Pattern to look for. The default interpretation is a regular expression, as described
in stringi::stringi-search-regex. Control options with
Match a fixed string (i.e. by comparing only bytes), using
Match character, word, line and sentence boundaries with
|
negate |
If |
Vectorised over string
and pattern
A character vector.
grep()
with argument value = TRUE
,
stringi::stri_subset()
for the underlying implementation.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | fruit <- c("apple", "banana", "pear", "pinapple")
str_subset(fruit, "a")
str_which(fruit, "a")
str_subset(fruit, "^a")
str_subset(fruit, "a$")
str_subset(fruit, "b")
str_subset(fruit, "[aeiou]")
# Returns elements that do NOT match
str_subset(fruit, "^p", negate = TRUE)
# Missings never match
str_subset(c("a", NA, "b"), ".")
str_which(c("a", NA, "b"), ".")
|
[1] "apple" "banana" "pear" "pinapple"
[1] 1 2 3 4
[1] "apple"
[1] "banana"
[1] "banana"
[1] "apple" "banana" "pear" "pinapple"
[1] "apple" "banana"
[1] "a" "b"
[1] 1 3
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