Hex String Check | Dataford Interview Questions

Zebra DataWedge integrations may receive diagnostic payloads represented as hexadecimal bytes. Implement a validator that determines whether an input string is a valid hexadecimal byte string.

A valid string contains one or more hexadecimal digits, 0-9, a-f, or A-F. It may optionally begin with 0x or 0X. After removing that prefix, the string must contain an even number of hexadecimal digits because each byte requires two digits. Do not accept whitespace, signs, separators, an empty string, or a prefix without digits.

Formal Specification

Given a string s, return True if it satisfies the rules above; otherwise return False. The input is a Python str, and the output is a Boolean.

Constraints

0 <= len(s) <= 10^5
The input is a Python string containing printable ASCII characters
The payload must contain an even number of hexadecimal digits
The entire value must not be converted to an integer

Function Signature

def is_hex_payload(s):

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