extracting value from the snmptrap

[chungl83]

I have a question regarding SNMP traps, there are some values which I would like to add to the trigger name. Right now, incoming traps look like following:

09:18:33 2019/06/19 PDU INFO:
  notificationtype               TRAP
  version                        0
  receivedfrom                   UDP: [192.168.1.150]:56281->[192.168.1.131]:162
  errorstatus                    0
  messageid                      0
  community                      public
  transactionid                  93
  errorindex                     0
  requestid                      0
VARBINDS:
  DISMAN-EVENT-MIB::sysUpTimeInstance type=67 value=Timeticks: (16796568) 1 day, 22:39:25.68
  SNMPv2-MIB::snmpTrapOID.0      type=6  value=OID: SNMPv2-SMI::enterprises.935.0.51
  SNMPv2-SMI::enterprises.935    type=4  value=STRING: "ABC self-test start"
  SNMP-COMMUNITY-MIB::snmpTrapAddress.0 type=64 value=IpAddress: 192.168.1.150
  SNMP-COMMUNITY-MIB::snmpTrapCommunity.0 type=4  value=STRING: "public"
  SNMPv2-MIB::snmpTrapEnterprise.0 type=6  value=OID: SNMPv2-SMI::enterprises.935

I want to use the value ABC self-test start for email notification. I read a lot about regex within macro functions and Item Preprocessing but not sure if this is the way to do it, I am a little bit stuck. Can anyone give me a hint
Thanks