Split a String at Specific Text Boundaries

This function locates specific text boundaries (like character, word, line, or sentence boundaries) and splits strings at the indicated positions.

stri_split_boundaries(str, n = -1L, tokens_only = FALSE, simplify = FALSE,
  ..., opts_brkiter = NULL)

character vector or an object coercible to


integer vector, maximal number of strings to return


single logical value; may affect the result if n is positive, see Details


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


additional settings for opts_brkiter


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


Vectorized over str and n.

If n is negative (default), then all pieces are extracted. Otherwise, if tokens_only is FALSE (this is the default, for compatibility with the stringr package), then n-1 tokes are extracted (if possible) and the n-th string gives the (non-split) remainder (see Examples). On the other hand, if tokens_only is TRUE, then only full tokens (up to n pieces) are extracted.

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


If simplify=FALSE (the default), then the functions return a list of character vectors.

Otherwise, stri_list2matrix with byrow=TRUE and n_min=n arguments 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.

See Also

Other search_split: stri_split_lines, stri_split, stringi-search

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

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

  • stri_split_boundaries
test <- "The\u00a0above-mentioned    features are very useful. " %s+%
   "Warm thanks to their developers. 123 456 789"
stri_split_boundaries(test, type="line")
stri_split_boundaries(test, type="word")
stri_split_boundaries(test, type="word", skip_word_none=TRUE)
stri_split_boundaries(test, type="word", skip_word_none=TRUE, skip_word_letter=TRUE)
stri_split_boundaries(test, type="word", skip_word_none=TRUE, skip_word_number=TRUE)
stri_split_boundaries(test, type="sentence")
stri_split_boundaries(test, type="sentence", skip_sentence_sep=TRUE)
stri_split_boundaries(test, type="character")

# filtered break iterator with the new ICU:
stri_split_boundaries("Mr. Jones and Mrs. Brown are very happy.
So am I, Prof. Smith.", type="sentence", locale="en_US@ss=standard") # ICU >= 56 only

# }
Documentation reproduced from package stringi, version 1.1.6, License: file LICENSE

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