extract: Extract matching patterns from a string.
In yutannihilation/rr4r: Rust Regex for R

Description Usage Arguments Examples

Extract matching patterns from a string.

Replace matched patterns in a string.

rr4r_extract(x, pattern, i = NULL)

rr4r_extract_all(x, pattern, i = NULL)

rr4r_extract_groups(x, pattern)

rr4r_replace(x, pattern, replacement)

`x`	A character vector to look for the patterns in.
`pattern`	A pattern to look for.
`i`	Index of a capture group to extract. If not specified, extract the whole match.
`replacement`	A pattern to replace, or a function to generate the replacement strings.

### These examples are taken from stringr's doc (?str_extract) ###

shopping_list <- c("apples x4", "bag of flour", "bag of sugar", "milk x2")
rr4r_extract(shopping_list, "\\d")
rr4r_extract(shopping_list, "[a-z]+")
rr4r_extract(shopping_list, "[a-z]{1,4}")
rr4r_extract(shopping_list, "\\b[a-z]{1,4}\\b")

# Extract all matches
rr4r_extract_all(shopping_list, "[a-z]+")
rr4r_extract_all(shopping_list, "\\b[a-z]+\\b")
rr4r_extract_all(shopping_list, "\\d")