Pattern Matching

Strongly typed wrappers around grepl that have the fixed and ignore.case arguments set internally (as well as the conflicting arguments).

Usage

greplf(pattern, x, useBytes = FALSE)

grepli(pattern, x, perl = FALSE, useBytes = FALSE)

Arguments

pattern

character string containing a regular expression (or character string for fixed = TRUE to be matched in the given character vector. Coerced by as.character to a character string if possible. If a character vector of length 2 or more is supplied, the first element is used with a warning. Missing values are allowed.

x

a character vector where matches are sought, or an object which can be coerced by as.character to a character vector. Long vectors are supported.

useBytes

logical. If TRUE the matching is done byte-by-byte rather than character-by-character.

perl

logical. Should Perl-compatible regexps be used?

Value

logical vector (match or not for each element of x).

Details

*f() suffixed functions have fixed = TRUE and conflicting arguments (perl and ignore.case) set as FALSE.

*i() suffixed functions have ignore.case = TRUE and the conflicting fixed argument set as FALSE.

For full documentation of the wrapped functions, see the help pages for grep.

See also

Other pattern-match-replacement-wrappers: grep-wrappers, grepv-wrappers, sub-wrappers

Examples

greplf("foo", c("foo", "Foo", "bar"))
#> [1]  TRUE FALSE FALSE
grepli("foo", c("foo", "Foo", "bar"))
#> [1]  TRUE  TRUE FALSE