@@define BASE32      ([A-Z2-7=*])
@@define BASE36      ([0-9A-Z])
@@define BASE58      ([1-9A-HJ-NP-Za-km-z])
@@define BASE62      ([0-9A-Za-z])
@@define BASE64      ([A-Za-z0-9+=/])
@@define BASE64URL   ([A-Za-z0-9_=-])
@@define BASE85      ([!-u])
@@define BASE91      ([\x21-\x7E])
