Validate string result by reglar expression

Hi

I have to validate a string result in teststand.

The result is a String like this 00:02:15:1x:yz:qp, where x can be in the range 0-9 or a-f or A-F. The same for y, z, q and p.

How do I test for that?

For 00:02:15:1 i can just type "00:02:15:1" in Expected String Value:

But how do I test for the rest?

I know that I can use regular expressions like [0-9a-fA-F], but I can't write that into Expected String Value: directly.

Thanks in advance.

Bjarne