stri_count_regex: Count the Number of Regex Pattern Matches

In stringi: THE string processing package for R

Description

This function counts the number of occurrences of matches to a regex pattern.

Usage

stri_count_regex(str, pattern, opts_regex = list())

Arguments

str	character vector of strings to search in
pattern	character vector of regular expressions
opts_regex	a named list as generated with stri_opts_regex

Details

Vectorized over str and pattern.

If pattern is empty, then the result is NA and a warning is generated.

Value

Returns an integer vector.

See Also

Other search_count: stri_count_charclass; stri_count_fixed; stri_count; stringi-search

Other search_regex: stri_detect_regex; stri_extract_all_regex, stri_extract_all_regex, stri_extract_first_regex, stri_extract_first_regex, stri_extract_last_regex, stri_extract_last_regex; stri_locate_all_regex, stri_locate_all_regex, stri_locate_first_regex, stri_locate_first_regex, stri_locate_last_regex, stri_locate_last_regex; stri_match_all_regex, stri_match_all_regex, stri_match_first_regex, stri_match_first_regex, stri_match_last_regex, stri_match_last_regex; stri_opts_regex; stri_replace_all_regex, stri_replace_all_regex, stri_replace_first_regex, stri_replace_first_regex, stri_replace_last_regex, stri_replace_last_regex; stri_split_regex, stri_split_regex; stringi-search-regex; stringi-search

Examples

## Not run: 
s <- "Lorem ipsum dolor sit amet, consectetur adipisicing elit."
stri_count_regex(s,"(s|el)it")
stri_count_regex(s,"i.i")
stri_count_regex(s,".it")
stri_count_regex("bab baab baaab",c("b.*?b","b.b"))
stri_count_regex(c("stringi w R","REXAMINE","123"), '( R|RE)')
stri_count_regex(c("stringi w R","REXAMINE","123"), '(i|I|1)')

## End(Not run)

Example output

[1] 2
[1] 2
[1] 2
[1] 3 2
[1] 1 1 0
[1] 2 1 1

stringi documentation built on May 2, 2019, 4:54 p.m.