TSergey, 2014-09-11, regexp

дано:
txt="""
Port ID                                  : 1:1
--------------------------------------------------------------------

Entity 2
Chassis ID Subtype                       : macAddress
Chassis ID                               : 00:1e:13:27:fc:b6
Port ID Subtype                          : Interface Alias
Port ID                                  : Gi4/7
Port Description                         : Link to S2-5-8
System Name                              : S2-1-1.II.tomica.ru
System Description                       : Cisco IOS Software, s72033_rp Softwar
                                           e (s72033_rp-ADVENTERPRISEK9_WAN-M),
                                           Version 12.2(33)SXI3, RELEASE SOFTWAR
                                           E (fc2)
                                           Technical Support: http://www.cisco.c
                                           om/t
System Capabilities                      : Router
Management Address                       : See Detail
MAC/PHY Configuration/Status             : See Detail
Unknown TLVS                             : See Detail

                                                                                                                    Port ID                                  : 1:13
--------------------------------------------------------------------

Entity 1
Chassis ID Subtype                       : macAddress
Chassis ID                               : b8:af:67:68:11:a8
Port ID Subtype                          : Interface Name
Port ID                                  : GigabitEthernet1/0/5
Port Description                         : LAG_Tomica_Connect
System Name                              : sw1-ln-tomsk-nts
System Description                       : HP Comware Platform Software, Softwar
                                           e Version 5.20.99 Release 2220P02
                                           HP A5500-24G-SFP EI Switch with 2 Int
                                           erface Slots
                                           Copyright (c) 2010-2013 Hewlett-Packa
System Capabilities                      : Bridge, Router
Management Address                       : See Detail
MAC/PHY Configuration/Status             : See Detail
Unknown TLVS                             : See Detail

Port ID                                  : 1:14
--------------------------------------------------------------------

Entity 3
Chassis ID Subtype                       : macAddress
Chassis ID                               : b8:af:67:68:11:a8
Port ID Subtype                          : Interface Name
Port ID                                  : GigabitEthernet1/0/6
Port Description                         : LAG_Tomica_Connect
System Name                              : sw1-ln-tomsk-nts
System Description                       : HP Comware Platform Software, Softwar
                                           e Version 5.20.99 Release 2220P02
                                           HP A5500-24G-SFP EI Switch with 2 Int
                                           erface Slots
                                           Copyright (c) 2010-2013 Hewlett-Packa
System Capabilities                      : Bridge, Router
Management Address                       : See Detail
MAC/PHY Configuration/Status             : See Detail
Unknown TLVS                             : See Detail
"""
Нужно выловить три блока текста, начиная с
"Port ID                                  : число:число
--------------------------------------------------------------------

Entity" до следующего такого шаблона или конца всего текста.


Порт получаю:
rx_port_id_group = re.compile(
    r"Port ID\s+:\s+(?P<port>(?:ch|\d+:)\d+)\s*(?:[-]{5,})\s*Entity\s*", re.IGNORECASE | re.MULTILINE | re.DOTALL)
for match in rx_port_id_group.finditer(v):
    print match.group("port")