Extract Text Between Text Boundaries

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Description

These functions extract text between specific text boundaries.

Usage

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stri_extract_all_boundaries(str, simplify = FALSE, omit_no_match = FALSE,
  ..., opts_brkiter = NULL)

stri_extract_last_boundaries(str, ..., opts_brkiter = NULL)

stri_extract_first_boundaries(str, ..., opts_brkiter = NULL)

stri_extract_all_words(str, simplify = FALSE, omit_no_match = FALSE,
  locale = NULL)

stri_extract_first_words(str, locale = NULL)

stri_extract_last_words(str, locale = NULL)

Arguments

str

character vector or an object coercible to

simplify

single logical value; if TRUE or NA, then a character matrix is returned; otherwise (the default), a list of character vectors is given, see Value

omit_no_match

single logical value; if FALSE, then a missing value will indicate that there are no words

...

additional settings for opts_brkiter

opts_brkiter

a named list with ICU BreakIterator's settings as generated with stri_opts_brkiter; NULL for default break iterator, i.e. line_break

locale

NULL or "" for text boundary analysis following the conventions of the default locale, or a single string with locale identifier, see stringi-locale.

Details

Vectorized over str.

For more information on the text boundary analysis performed by ICU's BreakIterator, see stringi-search-boundaries.

In case of stri_extract_*_words, Just like in stri_count_words, ICU's word BreakIterator iterator is used to locate word boundaries, and all non-word characters (UBRK_WORD_NONE rule status) are ignored.

Value

For stri_extract_all_*, if simplify=FALSE (the default), then a list of character vectors is returned. Each string consists of a separate word. In case of omit_no_match=FALSE and if there are no words or if a string is missing, a single NA is provided on output. Otherwise, stri_list2matrix with byrow=TRUE argument is called on the resulting object. In such a case, a character matrix with length(str) rows is returned. Note that stri_list2matrix's fill argument is set to an empty string and NA, for simplify equal to TRUE and NA, respectively.

For stri_extract_first_* and stri_extract_last_*, a character vector is returned. A NA element indicates no match.

See Also

Other locale_sensitive: %s<%, stri_compare, stri_count_boundaries, stri_duplicated, stri_enc_detect2, stri_locate_all_boundaries, stri_opts_collator, stri_order, stri_split_boundaries, stri_trans_tolower, stri_unique, stri_wrap, stringi-locale, stringi-search-boundaries, stringi-search-coll

Other search_extract: stri_extract_all, stri_match_all, stringi-search

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

Examples

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stri_extract_all_words("stringi: THE string processing package 123.48...")

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