re2_locate. re2r 0.1.0

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.

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.

Examples

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

     start end
[1,]     7   7


fruit <- c("apple", "banana", "pear", "pineapple")
re2_locate(fruit, "$")

     start end
[1,]     6   5
[2,]     7   6
[3,]     5   4
[4,]    10   9

re2_locate(fruit, "a")

     start end
[1,]     1   1
[2,]     2   2
[3,]     3   3
[4,]     5   5

re2_locate(fruit, "e")

     start end
[1,]     5   5
[2,]    NA  NA
[3,]     2   2
[4,]     4   4

re2_locate(fruit, c("a", "b", "p", "p"))

     start end
[1,]     1   1
[2,]     1   1
[3,]     1   1
[4,]     1   1


re2_locate_all(fruit, "a")

[[1]]
     start end
[1,]     1   1

[[2]]
     start end
[1,]     2   2
[2,]     4   4
[3,]     6   6

[[3]]
     start end
[1,]     3   3

[[4]]
     start end
[1,]     5   5


re2_locate_all(fruit, "e")

[[1]]
     start end
[1,]     5   5

[[2]]
     start end

[[3]]
     start end
[1,]     2   2

[[4]]
     start end
[1,]     4   4
[2,]     9   9


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

[[1]]
     start end
[1,]     1   1

[[2]]
     start end
[1,]     1   1

[[3]]
     start end
[1,]     1   1

[[4]]
     start end
[1,]     1   1
[2,]     6   6
[3,]     7   7



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

[[1]]
     start end
[1,]     1   1
[2,]     2   2
[3,]     3   3
[4,]     4   4
[5,]     5   5

[[2]]
     start end
[1,]     1   1
[2,]     2   2
[3,]     3   3
[4,]     4   4
[5,]     5   5
[6,]     6   6

[[3]]
     start end
[1,]     1   1
[2,]     2   2
[3,]     3   3
[4,]     4   4

[[4]]
      start end
 [1,]     1   1
 [2,]     2   2
 [3,]     3   3
 [4,]     4   4
 [5,]     5   5
 [6,]     6   6
 [7,]     7   7
 [8,]     8   8
 [9,]     9   9