al_ustr_rfind_chr
int al_ustr_rfind_chr(const ALLEGRO_USTR *us, int end_pos, int32_t c)
Introduced in 5.0.0
Search for the encoding of code point c
in us
backwards from byte offset end_pos
(exclusive). Returns the position where it is found or -1 if it is not found.
See also: al_ustr_find_chr
Examples: ex_utf8