Hello again,
I understand your suggested expression, and I feel like it should work but it isn't. It isn't matching anything.
This is a few sample input lines...
2015/04/06 12:38:15 (9):(5564) Return code is :55
2015/04/06 12:38:15 (9):(6600) Return code is :55
2015/04/06 12:41:31 (9):(3604) Return code is :1