RE: Regex 101 Exercise S2 - Verify a string is a hex number
In a previous post about verifying a hex number string with regex, there was a slight error. The regex should have been ^[A-Fa-f0-9]+$. A further refinement to prevent leading zeros (except for the number zero itself) would look like this: ^[A-Fa-f1-9][A-Fa-f0-9]*$.