Using character range in a character classe [a-z]
What is a character range in a character class? How to specify a character range in a character class in a regular expression?
I have a string of hexadecimal digits, 46594963656E7465722E636F6D and want to use character ranges in a character class to validate it.
A character range defines a set of possible characters of an ASCII code range using '-' between the first and the last character of the range in a character class.
Here are some examples of character ranges:
[0-9] # same as  [A-F] # same as [ABCDEF]
If '-' is the first or last character in a character class, it is treated as an ordinary character.
The regular expression to a match a string of hexadecimal digits is:
[0-9a-fA-F] [ - begin of a character class 0-9 - character range from 0 to 9 a-f - character range from a to f A-F - character range from A to F ] - end of a character class
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