stri_length: Count the Number of Code Points

View source: R/length.R

stri_lengthR Documentation

Count the Number of Code Points


This function returns the number of code points in each string.





character vector or an object coercible to


Note that the number of code points is not the same as the 'width' of the string when printed on the console.

If a given string is in UTF-8 and has not been properly normalized (e.g., by stri_trans_nfc), the returned counts may sometimes be misleading. See stri_count_boundaries for a method to count Unicode characters. Moreover, if an incorrect UTF-8 byte sequence is detected, then a warning is generated and the corresponding output element is set to NA, see also stri_enc_toutf8 for a method to deal with such cases.

Missing values are handled properly. For 'byte' encodings we get, as usual, an error.


Returns an integer vector of the same length as str.


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 length: %s$%(), stri_isempty(), stri_numbytes(), stri_pad_both(), stri_sprintf(), stri_width()


stri_length(c('abc', '123', '\u0105\u0104'))
stri_length('\u0105') # length is one, but...
stri_numbytes('\u0105') # 2 bytes are used
stri_numbytes(stri_trans_nfkd('\u0105')) # 3 bytes here but...
stri_length(stri_trans_nfkd('\u0105')) # ...two code points (!)
stri_count_boundaries(stri_trans_nfkd('\u0105'), type='character') # ...and one Unicode character

stringi documentation built on Jan. 11, 2023, 5:18 p.m.

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