The function checks whether given sequences of bytes forms a proper UTF-8 string.
character vector, a raw vector, or
a list of
Negative answer means that a string is surely not valid UTF-8.
Positive result does not mean that we should be absolutely sure.
represents ("Polish a with ogonek") in UTF-8
as well as ("A umlaut", "Ellipsis") in WINDOWS-1250.
Also note that UTF-8, as well as most 8-bit encodings,
have ASCII as their subsets
However, the longer the sequence, the bigger the possibility that the result is indeed in UTF-8 – this is because not all sequences of bytes are valid UTF-8.
This function is independent of the way R marks encodings in character strings (see Encoding and stringi-encoding).
Returns a logical vector. Its i-th element indicates whether the i-th string corresponds to a valid UTF-8 byte sequence.
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