GLib.utf8_find_prev_char

function utf8_find_prev_char(str: String, p: String): String {
    // Gjs wrapper for g_utf8_find_prev_char()
}
  

Given a position p with a UTF-8 encoded string str, find the start of the previous UTF-8 character starting before p. Returns null if no UTF-8 characters are present in str before p.

p does not have to be at the beginning of a UTF-8 character. No check is made to see if the character found is actually valid other than it starts with an appropriate byte.