[Ethereal-users] Bit masking problem in ethereal display mode

[Kevin]

I am running into a confusing problem wit bit masking in ethereal 
0.9.12 on freebsd 4.8.

What I want to do is look at the bits 0 - 5 in the 1st octet of the UDP 
payload and see if it is equal to 0x02.  My display filter is:

				udp[8] & 0x1f = 2

When I apply this, I get an error box that reads:
 The string "&" was unexpected in this context
Does some one know what i am doing wrong?  This filter works in tcpdump

Thanks,
Kevin Mason