stringi (version 0.3-1)

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)
stri_count_regex(str, pattern, opts_regex = NULL)

Arguments

str

character vector with strings to search in

...

additional arguments passed to the underlying functions; stri_count only

pattern,regex,fixed,coll,charclass

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

opts_collator

a named list with ICU Collator's settings as generated with stri_opts_collator; NULL for default settings; stri_count_coll only

opts_regex

a named list with ICU Regex settings as generated with stri_opts_regex; NULL for default settings; stri_count_regex only

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. Unless you are a very lazy person, please call the underlying functions directly for better performance.

See Also

Other search_count: stri_count_boundaries, stri_count_words; stringi-search

Examples

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)")