Validates a single-byte hexadecimal number (1 byte / 2 characters).
Reference: ST_UcharHexNumber in OOXML specification
The hexadecimal string to validate
The validated hexadecimal string
Error if the value is not a valid 2-character hex string
const hex = uCharHexNumber("FF"); // Valid Copy
const hex = uCharHexNumber("FF"); // Valid
Validates a single-byte hexadecimal number (1 byte / 2 characters).
Reference: ST_UcharHexNumber in OOXML specification