SCPacketTuple and using srcip unclear

Rules
1

I have a match(args) function that basically looks like this. I want it to match just on the IP address of one specific VM (I threw in an example here):

ipver, srcip, dstip, proto, sp, dp = SCPacketTuple()
if srcip.find("10.0.2.19") then
    return 1
end
return 0