stri_count: Count the Number of Pattern Occurrences

View source: R/search_count_4.R

stri_countR Documentation

Count the Number of Pattern Occurrences


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


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)



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

opts_collator, opts_fixed, opts_regex

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


Vectorized over str and pattern (with recycling of the elements in the shorter vector if necessary). This allows to, for instance, search for one pattern in each given string, search for each pattern in one given string, and search for the i-th pattern within the i-th string.

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.


All the functions return an integer vector.


Marek Gagolewski and other contributors

See Also

The official online manual of stringi at

Gagolewski M., stringi: Fast and portable character string processing in R, Journal of Statistical Software 103(2), 2022, 1-59, \Sexpr[results=rd]{tools:::Rd_expr_doi("10.18637/jss.v103.i02")}

Other search_count: about_search, stri_count_boundaries()


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}') # white-space - 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)')

stringi documentation built on May 29, 2024, 8:16 a.m.

Related to stri_count in stringi...