R: Get the indices of the nth instance of a pattern.

str_nth_instance_indices {filesstrings}

R Documentation

Get the indices of the nth instance of a pattern.

The nth instance of an pattern will cover a series of character indices. These functions tell you which indices those are.

str_nth_instance_indices(string, pattern, n)

str_first_instance_indices(string, pattern)

str_last_instance_indices(string, pattern)

`string`	A character vector. These functions are vectorized over this argument.
`pattern`	A character vector. Pattern(s) specified like the pattern(s) in the stringr package (e.g. look at `stringr::str_locate()`). If this has length >1 its length must be the same as that of `string`.
`n`	Then n for the nth instance of the pattern.

str_first_instance_indices(...) is just str_nth_instance_indices(..., n = 1).
str_last_instance_indices(...) is just str_nth_instance_indices(..., n = -1).

A two-column matrix. The ith row of this matrix gives the start and end indices of the nth instance of pattern in the ith element of string.

str_nth_instance_indices(c("abcdabcxyz", "abcabc"), "abc", 2)

[Package filesstrings version 2.5.0 Index]