Detect a pattern in the same way as SQL's LIKE and ILIKE operators

str_like() and str_like() follow the conventions of the SQL LIKE and ILIKE operators, namely:

Must match the entire string.
_ matches a single character (like .).
% matches any number of characters (like .*).
\% and \_ match literal % and _.

The difference between the two functions is their case-sensitivity: str_like() is case sensitive and str_ilike() is not.

Usage

str_like(string, pattern, ignore_case = deprecated())

str_ilike(string, pattern)

Arguments

string: Input vector. Either a character vector, or something coercible to one.
pattern: A character vector containing a SQL "like" pattern. See above for details.
ignore_case

Value

A logical vector the same length as string.

Note

Prior to stringr 1.6.0, str_like() was incorrectly case-insensitive.

Examples

fruit <- c("apple", "banana", "pear", "pineapple")
str_like(fruit, "app")
#> [1] FALSE FALSE FALSE FALSE
str_like(fruit, "app%")
#> [1]  TRUE FALSE FALSE FALSE
str_like(fruit, "APP%")
#> [1] FALSE FALSE FALSE FALSE
str_like(fruit, "ba_ana")
#> [1] FALSE  TRUE FALSE FALSE
str_like(fruit, "%apple")
#> [1]  TRUE FALSE FALSE  TRUE

str_ilike(fruit, "app")
#> [1] FALSE FALSE FALSE FALSE
str_ilike(fruit, "app%")
#> [1]  TRUE FALSE FALSE FALSE
str_ilike(fruit, "APP%")
#> [1]  TRUE FALSE FALSE FALSE
str_ilike(fruit, "ba_ana")
#> [1] FALSE  TRUE FALSE FALSE
str_ilike(fruit, "%apple")
#> [1]  TRUE FALSE FALSE  TRUE