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Available since: Gideros 2016.06
Class: utf8


Returns the number of UTF-8 characters in string s that start between positions i and j (both inclusive). The default for i is 1 and for j is -1. If it finds any invalid byte sequence, returns a false value plus the position of the first invalid byte.

(number) = utf8.len(s,i,j)


s: (string)
i: (number) optional
j: (number) optional

Return values

Returns (number) number of characters