Check if string contains pattern
This functions checks whether a string or character vector
x contains the string pattern. By default,
this function is case sensitive.
str_contains(x, pattern, ignore.case = FALSE, logic = NULL, switch = FALSE)
x |
Character string where matches are sought. May also be a character vector of length > 1 (see 'Examples'). |
pattern |
Character string to be matched in |
ignore.case |
Logical, whether matching should be case sensitive or not. |
logic |
Indicates whether a logical combination of multiple search pattern should be made.
|
switch |
Logical, if |
This function iterates all elements in pattern and
looks for each of these elements if it is found in
any element of x, i.e. which elements
of pattern are found in the vector x.
Technically, it iterates pattern and calls
grep(x, pattern[i], fixed = TRUE) for each element
of pattern. If switch = TRUE, it iterates
pattern and calls grep(pattern[i], x, fixed = TRUE)
for each element of pattern. Hence, in the latter case
(if switch = TRUE), x must be of length 1.
TRUE if x contains pattern.
str_contains("hello", "hel")
str_contains("hello", "hal")
str_contains("hello", "Hel")
str_contains("hello", "Hel", ignore.case = TRUE)
# which patterns are in "abc"?
str_contains("abc", c("a", "b", "e"))
# is pattern in any element of 'x'?
str_contains(c("def", "abc", "xyz"), "abc")
# is "abcde" in any element of 'x'?
str_contains(c("def", "abc", "xyz"), "abcde") # no...
# is "abc" in any of pattern?
str_contains("abc", c("defg", "abcde", "xyz12"), switch = TRUE)
str_contains(c("def", "abcde", "xyz"), c("abc", "123"))
# any pattern in "abc"?
str_contains("abc", c("a", "b", "e"), logic = "or")
# all patterns in "abc"?
str_contains("abc", c("a", "b", "e"), logic = "and")
str_contains("abc", c("a", "b"), logic = "and")
# no patterns in "abc"?
str_contains("abc", c("a", "b", "e"), logic = "not")
str_contains("abc", c("d", "e", "f"), logic = "not")Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.