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Some functions for utf-8 strings are available.
They assume that the string is encoded in utf-8. Otherwise, the
behavior is not defined. Defined in rep.util.utf8
.
Returns the number of characters of utf-8 encoded string.
Returns the portion of string, encoded in utf-8, starting at character number start and ending at the character before end (or the end of the string if end is not given). All indices start at zero.