Let's compose a regexp that would match strings containing one- or two-digit hexadecimal numbers. A "digit" of a hexadecimal number can be either a digit from 0 to 9 (including 9), or a small or capital letter from A to F (including F). The examples of hexadecimal numbers we want to match:
- AA
- 1
- 6f
- d9
- 3E
- c1
- 9
Note that your template should not match any other strings except for described hexadecimal numbers.
