Sometimes it is useful to find out which character sets appear in a
part of a buffer or a string. One use for this is in determining which
coding systems (see section 33.10 Coding Systems) are capable of representing all
of the text in question.
Function:find-charset-regionbeg end &optional translation
This function returns a list of the character sets that appear in the
current buffer between positions beg and end.
The optional argument translation specifies a translation table to
be used in scanning the text (see section 33.9 Translation of Characters). If it
is non-nil, then each character in the region is translated
through this table, and the value returned describes the translated
characters instead of the characters actually in the buffer.
This function returns a list of the character sets that appear in the
string string. It is just like find-charset-region, except
that it applies to the contents of string instead of part of the
current buffer.
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