stringi-search {stringi} | R Documentation

## String Searching

### Description

This man page instructs how to perform string search-based operations in stringi.

### Details

The following independent string searching “engines” are available in stringi.

- `stri_*_regex` – ICU's regular expressions, see stringi-search-regex,

- `stri_*_fixed` – locale-independent bytewise pattern matching, see stringi-search-fixed,

- `stri_*_coll` – ICU's `StringSearch`, locale-sensitive, Collator-based pattern search, useful for natural language processing tasks, see stringi-search-coll,

- `stri_*_charclass` – character classes search, e.g. Unicode General Categories or Binary Properties, see stringi-search-charclass,

- `stri_*_boundaries` – text boundary analysis, see stringi-search-boundaries

Each “engine” is able to perform many search-based operations. These may include:

- `stri_detect_*` - detect if a pattern occurs in a string, see e.g. `stri_detect`,

- `stri_count_*` - count the number of pattern occurrences, see e.g. `stri_count`,

- `stri_locate_*` - locate all, first, or last occurrences of a pattern, see e.g. `stri_locate`,

- `stri_extract_*` - extract all, first, or last occurrences of a pattern, see e.g. `stri_extract` and, in case of regexes, `stri_match`,

- `stri_replace_*` - replace all, first, or last occurrences of a pattern, see e.g. `stri_replace` and also `stri_trim`,

- `stri_split_*` - split a string into chunks indicated by occurrences of a pattern, see e.g. `stri_split`,

- `stri_startswith_*` and `stri_endswith_*` detect if a string starts or ends with a pattern match, see e.g. `stri_startswith`,

- `stri_subset_*` - return a subset of a character vector with strings that match a given pattern, see e.g. `stri_subset`.

### See Also

Other search_charclass: `stri_trim_both`, `stringi-search-charclass`

Other search_coll: `stri_opts_collator`, `stringi-search-coll`

Other search_count: `stri_count_boundaries`, `stri_count`

Other search_detect: `stri_detect`, `stri_startswith`

Other search_extract: `stri_extract_all_boundaries`, `stri_extract_all`, `stri_match_all`

Other search_fixed: `stri_opts_fixed`, `stringi-search-fixed`

Other search_locate: `stri_locate_all_boundaries`, `stri_locate_all`

Other search_regex: `stri_opts_regex`, `stringi-search-regex`

Other search_replace: `stri_replace_all`, `stri_replace_na`, `stri_trim_both`

Other search_split: `stri_split_boundaries`, `stri_split_lines`, `stri_split`

Other search_subset: `stri_subset`

Other stringi_general_topics: `stringi-arguments`, `stringi-encoding`, `stringi-locale`, `stringi-package`, `stringi-search-boundaries`, `stringi-search-charclass`, `stringi-search-coll`, `stringi-search-fixed`, `stringi-search-regex`

Other text_boundaries: `stri_count_boundaries`, `stri_extract_all_boundaries`, `stri_locate_all_boundaries`, `stri_opts_brkiter`, `stri_split_boundaries`, `stri_split_lines`, `stri_trans_tolower`, `stri_wrap`, `stringi-search-boundaries`

[Package stringi version 1.1.1 Index]