Count the number of matches in a string.

Usage

re2_count(string, pattern, anchor = UNANCHORED, parallel = FALSE, grain_size = 1e+05, ...)

Arguments

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

Value

An integer vector.

Description

Count the number of matches in a string. Vectorised over strings and patterns.

Examples

re2_count("one", "(o.e)")

[1] 1

re2_count("123-234-2222", "\\d\\d\\d-\\d\\d\\d-\\d\\d\\d\\d")

[1] 1


words = c("sunny","beach","happy","really")
re2_count(words, "y")

[1] 1 0 1 1

re2_count(words, "^b")

[1] 0 1 0 0

re2_count(words, "[abc]")

[1] 0 3 1 1


# vectorize
re2_count("This", letters)

 [1] 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0