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Asked: 2026-05-13T06:08:15+00:00

I’m gathering some info from some cisco devices using python and pexpect, and had

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I’m gathering some info from some cisco devices using python and pexpect, and had a lot of success with REs to extract pesky little items. I’m afraid i’ve hit the wall on this. Some switches stack together, I have identified this in the script and used a separate routine to parse the data. If the switch is stacked you see the following (extracted from the sho ver output) 

Top Assembly Part Number        : 800-25858-06
Top Assembly Revision Number    : A0
Version ID                      : V08
CLEI Code Number                : COMDE10BRA
Hardware Board Revision Number  : 0x01


Switch   Ports  Model              SW Version              SW Image
------   -----  -----              ----------              ----------
*    1   52     WS-C3750-48P       12.2(35)SE5             C3750-IPBASE-M  
     2   52     WS-C3750-48P       12.2(35)SE5             C3750-IPBASE-M
     3   52     WS-C3750-48P       12.2(35)SE5             C3750-IPBASE-M
     4   52     WS-C3750-48P       12.2(35)SE5             C3750-IPBASE-M


Switch 02 
---------
Switch Uptime                   : 11 weeks, 2 days, 16 hours, 27 minutes
Base ethernet MAC Address       : 00:26:52:96:2A:80
Motherboard assembly number     : 73-9675-15

When I encounter this I need to extract the switch number & model for each in the table of 4, (sw can be ignored, but there can be between 1 and 9 switches) It’s the multiple line thing that has got me as I’ve been ok with the rest. Any ideas please?

OK apologies. My regex simply started looking at the last group of – until.. then I couldn’t work ou where to go!
-{10]\s-{10}(.+)Switch

The model will change and the number of switches will change, I need to capture the 4 lines in this example which are 

*    1   52     WS-C3750-48P       12.2(35)SE5             C3750-IPBASE-M  
     2   52     WS-C3750-48P       12.2(35)SE5             C3750-IPBASE-M
     3   52     WS-C3750-48P       12.2(35)SE5             C3750-IPBASE-M
     4   52     WS-C3750-48P       12.2(35)SE5             C3750-IPBASE-M

But each switch could be a different model and there could be between 1 and 9. For this example ideally i’d like to get 

*,1,WS-C3750-48P
,2,WS-C3750-48P
,3,WS-C3750-48P
,4,WS-C3750-48P

(the asterisk means master)
but getting those lines would set me on the right track

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1 Answer

  1. Editorial Team
    x="""Top Assembly Part Number        : 800-25858-06
Top Assembly Revision Number    : A0
Version ID                      : V08
CLEI Code Number                : COMDE10BRA
Hardware Board Revision Number  : 0x01


Switch   Ports  Model              SW Version              SW Image
------   -----  -----              ----------              ----------
*    1   52     WS-C3750-48P       12.2(35)SE5             C3750-IPBASE-M
     2   52     WS-C3750-48P       12.2(35)SE5             C3750-IPBASE-M
     3   52     WS-C3750-48P       12.2(35)SE5             C3750-IPBASE-M
     4   52     WS-C3750-48P       12.2(35)SE5             C3750-IPBASE-M


Switch 02
---------
Switch Uptime                   : 11 weeks, 2 days, 16 hours, 27 minutes
Base ethernet MAC Address       : 00:26:52:96:2A:80
Motherboard assembly number     : 73-9675-15"""

>>> import re
>>> re.findall("^\*?\s*(\d)\s*\d+\s*([A-Z\d-]+)",x,re.MULTILINE)
[('1', 'WS-C3750-48P'), ('2', 'WS-C3750-48P'), ('3', 'WS-C3750-48P'), ('4', 'WS-C3750-48P')]

    UPDATE: because OP edited question, and Thanks Tom for pointing out for +

    >>> re.findall("^(\*?)\s+(\d)\s+\d+\s+([A-Z\d-]+)",x,re.MULTILINE)
[('*', '1', 'WS-C3750-48P'), ('', '2', 'WS-C3750-48P'), ('', '3', 'WS-C3750-48P'), ('', '4', 'WS-C3750-48P')]
>>>
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