Answer:
^[A-Fa-f0-9]+$
Explanation:
The hexadecimal (Base 16) can contain 0-9, A-F, a-f and any of these can be the part of the Hexadecimal base 16 code.
In python we have the re.match function, and the syntax is as below:
re.match(pattern, string, flag=0). And we can use this function to check whether the entered char variable is a regex or not. Like:
re.match(pattern,x, flag=0)
