Utf8.len

Available since: Gideros 2016.06

Description

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(sij,)

's: (string) '
i: (number) optional
j: (number) optional
Returns (number) number of characters