re2_subset: Keep strings matching a pattern.

In re2r: RE2 Regular Expression

Description

This is a convenient wrapper around x[re2_detect(x, pattern)]. Vectorised over strings and patterns.

Usage

re2_subset(string, pattern, anchor = 0, omit_na = TRUE, parallel = FALSE,
  grain_size = 1e+05, ...)

Arguments

string	a character vector
pattern	a character vector or pre-compiled regular expressions
anchor	see UNANCHORED
omit_na	omit na result
parallel	use multithread
grain_size	a minimum chunk size for tuning the behavior of parallel algorithms
...	further arguments passed to re2

Value

A character vector.

Examples

fruit <- c("apple", "banana", "pear", "pinapple")
re2_subset(fruit, "a")
re2_subset(fruit, "^a")
re2_subset(fruit, "a$")
re2_subset(fruit, "b")
re2_subset(fruit, "[aeiou]")

re2_subset(c("a", NA, "b"), ".")

re2r documentation built on May 2, 2019, 12:35 p.m.