Fix for the regular expression for parsing MatchCGroup

[kocmo]

Fix for the regular expression for parsing MatchCGroup. Previously it was failing to process rules like:

0 0 MARK       6    --  *      *       0.0.0.0/0            0.0.0.0/0            cgroup 1000 MARK set 0xdeadbeef
0 0 MARK       6    --  *      *       0.0.0.0/0            0.0.0.0/0            cgroup ! 2000 MARK set 0xdeadbeef
0 0 MARK       6    --  *      *       0.0.0.0/0            0.0.0.0/0            cgroup /system.slice/systemd-logind.service MARK set 0xdeadbeef
0 0 MARK       6    --  *      *       0.0.0.0/0            0.0.0.0/0            cgroup ! /system.slice/systemd-journald.service MARK set 0xdeadbeef

[singchia]

Great!

[kocmo]

Thank you so much for your project