Switch location of matches to location of non-matches

Invert a matrix of match locations to match the opposite of what was previously matched.

Usage

invert_match(loc)

Arguments

loc

matrix of match locations, as from str_locate_all()

Value

numeric match giving locations of non-matches

Examples

numbers <- "1 and 2 and 4 and 456"
num_loc <- str_locate_all(numbers, "[0-9]+")[[1]]
str_sub(numbers, num_loc[, "start"], num_loc[, "end"])
#> [1] "1"   "2"   "4"   "456"

text_loc <- invert_match(num_loc)
str_sub(numbers, text_loc[, "start"], text_loc[, "end"])
#> [1] ""      " and " " and " " and " ""