Extract Data Between Text Boundaries

These functions extract data between text boundaries.

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)


character vector or an object coercible to


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


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


additional settings for opts_brkiter


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


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


Vectorized over str.

For more information on 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 the word boundaries, and all non-word characters (UBRK_WORD_NONE rule status) are ignored.


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 TRUE and NA, respectively.

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

See Also

Other search_extract: stri_extract_all, stri_match_all, stringi-search

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

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

  • stri_extract_all_boundaries
  • stri_extract_last_boundaries
  • stri_extract_first_boundaries
  • stri_extract_all_words
  • stri_extract_first_words
  • stri_extract_last_words
stri_extract_all_words("stringi: THE string processing package 123.48...")

# }
Documentation reproduced from package stringi, version 1.4.3, License: file LICENSE

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