method
parse_printf_format
parse_printf_format(format, opts)
public
% <flag> [#0- +] <minimum field width> (*|*[1-9][0-9]*$|[1-9][0-9]*) <precision>.(*|*[1-9][0-9]*$|[1-9][0-9]*|)? #<length modifier>(hh|h|l|ll|L|q|j|z|t) <conversion specifier>[diouxXeEfgGcsb%]