Hexadecimal is the base 16 number system. It is typically written using all the base 10 numerals, as well as the letters "a" through "f".
We want to write a pattern to match all hexadecimal characters. As a start, we have the following pattern:
hex_pattern = \ /^(0|1|2|3|4|5|6|7|8|9|a|b|c|d|e|f)+$/ # Valid matches "123abd" =~ hex_pattern #=> 0 "456789" =~ hex_pattern #=> 0 # Invalid, not hex characters "876jkl" =~ hex_pattern #=> nil
While the pattern does seem to work, it is a bit long and verbose. Is there any way we can simplify the pattern?