stri_extract_all_charclass: Extract Character Class Matches

Description

These functions extract substrings of str that consists of characters from character classes specified by pattern.

Generally, this is the way to extract single characters, only. Longer substrings, however, may be extracted, with the stri_extract_all_charclass function and merge=TRUE.

Usage

stri_extract_all_charclass(str, pattern, merge = TRUE)
stri_extract_first_charclass(str, pattern)
stri_extract_last_charclass(str, pattern)

Arguments

str

character vector to search in

pattern

character vector specifying character classes to match, see stringi-search-charclass

merge

logical [stri_extract_all_charclass only]; should consecutive matches be merged into one string?

Value

For stri_extract_all_charclass, a list of max(length(str), length(pattern), length(merge)) character vectors is returned. Otherwise, you get a character vector. NA if not found.

Details

Vectorized over str, pattern, and merge.

Other search_charclass: stri_count_charclass; stri_detect_charclass; stri_locate_all_charclass, stri_locate_first_charclass, stri_locate_first_charclass, stri_locate_last_charclass, stri_locate_last_charclass; stri_replace_all_charclass, stri_replace_first_charclass, stri_replace_first_charclass, stri_replace_last_charclass, stri_replace_last_charclass; stri_split_charclass; stri_trim, stri_trim, stri_trim_both, stri_trim_left, stri_trim_right; stringi-search-charclass; stringi-search

Other search_extract: stri_extract_all_coll, stri_extract_first_coll, stri_extract_first_coll, stri_extract_last_coll, stri_extract_last_coll; stri_extract_all_regex, stri_extract_first_regex, stri_extract_first_regex, stri_extract_last_regex, stri_extract_last_regex; stri_extract_all; stri_extract_first; stri_extract_last; stri_extract_words; stri_extract; stringi-search

Examples

Run this code

if (stri_install_check(silent=TRUE))
stri_extract_all_charclass(c('AbcdeFgHijK', 'abc', 'ABC'), '\\p{Ll}')

if (stri_install_check(silent=TRUE))
stri_extract_all_charclass(c('AbcdeFgHijK', 'abc', 'ABC'), '\\p{Ll}', merge=FALSE)

if (stri_install_check(silent=TRUE))
stri_extract_first_charclass('AaBbCc', '\\p{Ll}')

if (stri_install_check(silent=TRUE))
stri_extract_last_charclass('AaBbCc', '\\p{Ll}')

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