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# stri_enc_isascii: Check If a Data Stream Is Possibly in ASCII

## Description

The function checks whether all bytes in a string are <= 127.

## Usage

    stri_enc_isascii(str)

## Arguments

`str` | character vector, a raw vector, or a list of `raw` vectors

## Details

This function is independent of the way R marks encodings in character strings (see Encoding and stringi-encoding).

## Value

Returns a logical vector. The i-th element indicates whether the i-th string corresponds to a valid ASCII byte sequence.

## Author(s)

Marek Gagolewski and other contributors

## See Also

The official online manual of stringi at https://stringi.gagolewski.com/

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 encoding_detection: `about_encoding`, `stri_enc_detect()`, `stri_enc_detect2()`, `stri_enc_isutf16be()`, `stri_enc_isutf8()`

## Examples

    stri_enc_isascii(letters[1:3])
    ## [1] TRUE TRUE TRUE
    stri_enc_isascii('\u0105\u0104')
    ## [1] FALSE