stringi is THE R package for fast, correct, consistent,
and convenient string/text manipulation.
It gives predictable results on every platform, in each locale,
and under any “native” character encoding.
Keywords: R, text processing, character strings,
internationalization, localization, ICU, ICU4C, i18n, l10n, Unicode.
License: The BSD-3-clause license for the package code,
the ICU license for the accompanying ICU4C distribution,
and the UCD license for the Unicode Character Database.
See the COPYRIGHTS and LICENSE file for more details.
Details
Manual pages on general topics:
stringi-encoding – character encoding issues, including
information on encoding management in stringi, as well as
on encoding detection and conversion.
stringi-locale – locale issues, including locale
management and specification in stringi, and the list of
locale-sensitive operations. In particular, see
stri_opts_collator for a description of the string
collation algorithm, which is used for string comparing, ordering,
sorting, case-folding, and searching.
stringi-arguments – information on how stringi
treats its functions' arguments.
Facilities available
Refer to the following:
stringi-search for string searching facilities;
these include pattern searching, matching, string splitting, and so on.
The following independent search engines are provided:
stringi-search-regex – with ICU (Java-like) regular expressions,
stringi-search-coll – locale-aware pattern matching
for natural language processing tasks,
stringi-search-charclass – seeking elements of
particular character classes, like “all whitespaces” or “all digits”,
stringi-search-boundaries – text boundary analysis.
stri_datetime_format for date/time formatting
and parsing. Also refer to the links therein for other date/time/time zone-
related operations.
stri_stats_general and stri_stats_latex
for gathering some fancy statistics on a character vector's contents.
stri_join, stri_dup, %s+%,
and stri_flatten for concatenation-based operations.
stri_sub for extracting and replacing substrings,
and stri_reverse for a joyful function
to reverse all code points in a string.
stri_length (among others) for determining the number
of code points in a string. See also stri_count_boundaries
for counting the number of Unicode characters
and stri_width for approximating the width of a string.
stri_trim (among others) for
trimming characters from the beginning or/and end of a string,
see also stringi-search-charclass, and stri_pad
for padding strings so that they are of the same width.
Additionally, stri_wrap wraps text into lines.
stri_trans_tolower (among others) for case mapping,
i.e., conversion to lower, UPPER, or Title Case,
stri_trans_nfc (among others) for Unicode normalization,
stri_trans_char for translating invidual code points,
and stri_trans_general for other very general yet powerful
text transforms, including transliteration.
stri_cmp, %s<%, stri_order,
stri_sort, stri_unique, and
stri_duplicated for collation-based,
locale-aware operations, see also stringi-locale.
stri_split_lines (among others)
to split a string into text lines.
stri_escape_unicode (among others) for escaping
certain code points.
stri_rand_strings, stri_rand_shuffle,
and stri_rand_lipsum for generating (pseudo)random strings.
DRAFT API: stri_read_raw,
stri_read_lines, and stri_write_lines
for reading and writing text files.
Note that each man page provides many further links to other
interesting facilities and topics.
Author(s)
Marek Gagolewski,
with contributions from Bartek Tartanus.
ICU4C was developed by IBM and others.
The Unicode Character Database is due to Unicode, Inc.;
see the COPYRIGHTS file for more details.
providing 
.