The pattern match group.
The pattern match groups are presented in a bitmap format.
in receiving order:
OCTET 1 OCTET 2 .....
xxxxxxxx xxxxxxxx .....
|| || |_ pattern match group
|| ||
|| ||___ pattern match group 8
|| |____ pattern match group 7
|| . . .
||_________ pattern match group 2
|__________ pattern match group 1
where x : 1 - The represented pattern match group is selected
0 - The represented pattern match group is not selected