re2_locate: Locate the position of patterns in a string.

In re2r: RE2 Regular Expression

Description

Locate the position of patterns in a string.If the match is of length 0, (e.g. from a special match like $) end will be one character less than start. Vectorised over string and pattern.

Usage

re2_locate(string, pattern, parallel = FALSE, grain_size = 1e+05, ...)

re2_locate_all(string, pattern, parallel = FALSE, grain_size = 1e+05, ...)

Arguments

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

Value

For re2_locate, an integer matrix. First column gives start postion of match, and second column gives end position. For re2_locate_all a list of integer matrices.

Examples

re2_locate("yabba dabba doo", "d")

fruit <- c("apple", "banana", "pear", "pineapple")
re2_locate(fruit, "$")
re2_locate(fruit, "a")
re2_locate(fruit, "e")
re2_locate(fruit, c("a", "b", "p", "p"))

re2_locate_all(fruit, "a")
re2_locate_all(fruit, "e")
re2_locate_all(fruit, c("a", "b", "p", "p"))

# Find location of every character
re2_locate_all(fruit, "\\P{M}")

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