RE: Regex 101 Exercise S2 - Verify a string is a hex number

It turns out I made a little mistake. The regex should be more like ^[A-Fa-f0-9]+$. The "0" problem might be sorted like this ^[A-Fa-f1-9][A-Fa-f0-9]*$.

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Wikipedia: Regex, Regular expression, Hexadecimal, Wikipedia: Binary numeral system, Wikipedia: MSDN, Wikipedia: C Sharp programming language, Grep

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