betterGrep: Better grep

Description Usage Arguments Value Examples

View source: R/betterGrep.R

Description

Search for pattern matches, where trying to match to NA comes back as FALSE

Usage

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betterGrep(pattern, x, ignore.case = T, fixed = T)

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.

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.

ignore.case

logical. if FALSE, the pattern matching is case sensitive and if TRUE, case is ignored during matching.

fixed

logical. If TRUE, pattern is a string to be matched as is. Overrides all conflicting arguments.

Value

Numeric vector holding the indices of elements of x that had matches

Examples

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x = c("Alpha", "Beta", "Bet", NA_character_, "B")
betterGrep(pattern = "a", x)
betterGrep(pattern = NA, x)
betterGrep(pattern = NA, x, ignore.case = F)
betterGrep("Beta", x)
betterGrep("B", x)
betterGrep("X", x)

debarros/dbTools documentation built on Sept. 18, 2020, 10:51 a.m.