Allows for fast, correct, consistent, portable,
    as well as convenient character string/text processing in every locale
    and any native encoding. Owing to the use of the ICU library,
    the package provides R users with platform-independent functions
    known to Java, Perl, Python, PHP, and Ruby programmers. Among available
    features there are: pattern searching (e.g., with ICU Java-like regular
    expressions or the Unicode Collation Algorithm), random string generation,
    case mapping, string transliteration, concatenation,
    Unicode normalization, date-time formatting and parsing, etc.
Marek Gagolewski [aut, cre] and Bartek Tartanus [ctb] (stringi source code);
    IBM and other contributors (ICU4C 55.1 source code);
    Unicode, Inc. (Unicode Character Database)