stri_count: Count the Number of Pattern Matches

Description

These functions count the number of occurrences of a pattern in a string.

Usage

stri_count(str, ..., regex, fixed, coll, charclass)
stri_count_charclass(str, pattern)
stri_count_coll(str, pattern, ..., opts_collator = NULL)
stri_count_fixed(str, pattern, ..., opts_fixed = NULL)
stri_count_regex(str, pattern, ..., opts_regex = NULL)

Arguments

str

character vector with strings to search in

...

supplementary arguments passed to the underlying functions, including additional settings for opts_collator, opts_regex, opts_fixed, and so on

pattern, regex, fixed, coll, charclass

character vector defining search patterns; for more details refer to stringi-search

opts_collator, opts_fixed, opts_regex

a named list used to tune up a search engine's settings; see stri_opts_collator, stri_opts_fixed, and stri_opts_regex, respectively; NULL for default settings;

Value

All the functions return an integer vector.

Details

Vectorized over str and pattern. If pattern is empty, then the result is NA and a warning is generated. stri_count is a convenience function. It calls either stri_count_regex, stri_count_fixed, stri_count_coll, or stri_count_charclass, depending on the argument used; relying on one of those underlying functions will be faster.

Examples

Run this code

s <- "Lorem ipsum dolor sit amet, consectetur adipisicing elit."
stri_count(s, fixed="dolor")
stri_count(s, regex="\\p{L}+")

stri_count_fixed(s, " ")
stri_count_fixed(s, "o")
stri_count_fixed(s, "it")
stri_count_fixed(s, letters)
stri_count_fixed("babab", "b")
stri_count_fixed(c("stringi", "123"), "string")

stri_count_charclass(c("stRRRingi", "STrrrINGI", "123"),
   c("\\p{Ll}", "\\p{Lu}", "\\p{Zs}"))
stri_count_charclass(" \t\n", "\\p{WHITE_SPACE}") # white space - binary property
stri_count_charclass(" \t\n", "\\p{Z}") # whitespace - general category (note the difference)

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", "123"), "^(s|1)")