Layer7 search for hex 00

Hi,

I am using the Layer7 features of ORS 6.32.3 and overall it is working great. However, I can’t seem to search for packets that have a hex value of 00. For example, if I try ^\x03\x01 it works fine, but if I try ^\x03\x00 or ^\x03\x0 I either get an error or it simply doesn’t work. Is there a proper way I can search for packets that have contain something similar to ^\x03\x00\x01

I am aware of using .? but this doesn’t seem to specifically search for \x00

I appreciate any input on the matter.

^\x03\x01 using for what?

As an example. If I run Wireshark I see that the packet I am looking for starts with 03 00 01
I am trying to find how to search for this in MikroTik Layer7 regexp

you said to me looking for starts with 03 00 01, that what you meaing when you see 03 00 01
Buz i receive no information