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GNU Emacs Lisp Reference Manual

33.8 Scanning for Character Sets

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-region beg 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.

Function: find-charset-string string &optional translation

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.