Is there a way to check the maximum hex value allowed in a string?

Question

I have to check a string which should only contain hex values (using regex code ^[a-fA-F0-9]{1,14}$ here) for a maximum allowed value.

The allowed hex range for the string is between 0 and 1fffffffffffff.

Is there any way to check this with regex?

Answer 1

Is that what you want:

^(?:[01][a-f0-9]{13}|[a-f0-9]{1,13})$

Code:

IsMatch(string, "^(?:[01][a-f0-9]{13}|[a-f0-9]{1,13})$", IgnoreCase)