Regular expression to validate hex string

Asked 2008-11-13T17:51:57.773

I'm using this simple regular expression to validate a hex string:

^[A-Fa-f0-9]{16}$

As you can see, I'm using a quantifier to validate that the string is 16 characters long. I was wondering if I can use another quantifier in the same regex to validate the string length to be either 16 or 18 (not 17).

.net regex

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2 Answers

I believe

^([A-Fa-f0-9]{2}){8,9}$

will work.

This is nice because it generalizes to any even-length string.

answered 2008-11-13T17:54:42.620

^(?:[A-Fa-f0-9]{16}|[A-Fa-f0-9]{18})$

answered 2008-11-13T17:53:24.773

Regular expression to validate hex string

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