stri_enc_detect2: [DEPRECATED] Detect Locale-Sensitive Character Encoding#


This function tries to detect character encoding in case the language of text is known.


stri_enc_detect2(str, locale = NULL)



character vector, a raw vector, or a list of raw vectors


NULL or '' for the default locale, or a single string with locale identifier.


Vectorized over str.

First, the text is checked whether it is valid UTF-32BE, UTF-32LE, UTF-16BE, UTF-16LE, UTF-8 (as in stri_enc_detect, this is roughly inspired by ICU’s i18n/csrucode.cpp) or ASCII.

If locale is not NA and the above fails, the text is checked for the number of occurrences of language-specific code points (data provided by the ICU library) converted to all possible 8-bit encodings that fully cover the indicated language. The encoding is selected based on the greatest number of total byte hits.

The guess is of course imprecise, as it is obtained using statistics and heuristics. Because of this, detection works best if you supply at least a few hundred bytes of character data that is in a single language.

If you have no initial guess on the language and encoding, try with stri_enc_detect (uses ICU facilities).


Just like stri_enc_detect, this function returns a list of length equal to the length of str. Each list element is a data frame with the following three named components:

  • Encoding – string; guessed encodings; NA on failure (if and only if encodings is empty),

  • Language – always NA,

  • Confidence – numeric in [0,1]; the higher the value, the more confidence there is in the match; NA on failure.

The guesses are ordered by decreasing confidence.


Marek Gagolewski and other contributors

See Also#

The official online manual of stringi at

Gagolewski M., stringi: Fast and portable character string processing in R, Journal of Statistical Software 103(2), 2022, 1-59, doi:10.18637/jss.v103.i02

Other locale_sensitive: %s<%(), about_locale, about_search_boundaries, about_search_coll, stri_compare(), stri_count_boundaries(), stri_duplicated(), stri_extract_all_boundaries(), stri_locate_all_boundaries(), stri_opts_collator(), stri_order(), stri_rank(), stri_sort_key(), stri_sort(), stri_split_boundaries(), stri_trans_tolower(), stri_unique(), stri_wrap()

Other encoding_detection: about_encoding, stri_enc_detect(), stri_enc_isascii(), stri_enc_isutf16be(), stri_enc_isutf8()