int (@NotNull String line, int i) { if (i >= line.length()) return -1; char c = line.charAt(i++); if (c == '\\') { // like \uFFFD char c1 = line.charAt(i++); if (c1 == 'u') { while (i < line.length() && line.charAt(i) == 'u') i++; i += 4; } else if (c1 >= '0' && c1 <= '7') { // octal escape char c2 = i < line.length() ? line.charAt(i) : 0; if (c2 >= '0' && c2 <= '7') { i++; char c3 = i < line.length() ? line.charAt(i) : 0; if (c3 >= '0' && c3 <= '7' && c1 <= '3') { i++; } } } } return i; }