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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.
The optional argument translation specifies a translation table to
be used in scanning the text (see section 33.9 Translation of Characters). If it
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.
find-charset-region, except that it applies to the contents of string instead of part of the current buffer.
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