grepl_multi: Multiple Pattern Matching
In svenhalvorson/SvenSFPS: Sven's R Jiggering

Description Usage Arguments Value Author(s) Examples

grepl_multi is a wrapper for grepl that allows multiple inputs to the pattern argument. Depending on the all argument, it either returns whether each element of x matches all or at least one of the patterns in patterns. grepl_multi inherits all the other parameters of grepl.

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grepl_multi <- function(patterns, x, all = FALSE,
                        ignore.case = FALSE, perl = FALSE,
                        fixed = FALSE, useBytes = FALSE)

`patterns`	A character vector of regular expressions (or strings if `fixed == TRUE`) to be matched onto x `x`.
`x`	A character vector where matches are sought.
`all`	if `TRUE` then all values in `patterns` must match. Otherwise, at least one one match among `patterns` is required to return `TRUE`
`...`	refer to `?grepl` for inherited arguments

a logical vector of the same length as x

Sven Halvorson (svenedmail@gmail.com)

pat = letters[1:3]
strings = c("foo", "bar", "cabbie", "green chile")

# First we ask, which one of these stings have at least one of "a", "b", or "c"
cbind(strings,grepl_multi(patterns = pat, x = strings))

# Or we can ask, which strings have all three of "a", "b", and "c"
cbind(strings,grepl_multi(patterns = pat, x = strings, all = TRUE))