issue with regular expression python

Question

i have 2 line as a command output sh ip int bri and i want to fetch all up interfaces. my re expression matching one line which has FastEthernet0/0 but not loopback0. any suggestions please.

line

'Loopback0 1.1.1.1 YES NVRAM up up'

line1

'FastEthernet0/0 10.0.0.1 YES NVRAM up up'

match=re.search(r'\w+\d+?/?\d+?\s+\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\s+\w+\s+\w+\s+(up|down)\s+(up|down)', line1)

match.group()

'FastEthernet0/0 10.0.0.1 YES NVRAM up up'

match=re.search(r'\w+\d+?/?\d+?\s+\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\s+\w+\s+\w+\s+(up|down)\s+(up|down)', line)

match.group()

Traceback (most recent call last): File "", line 1, in match.group() AttributeError: 'NoneType' object has no attribute 'group'

You can update re to r'\w+[\d/]+\s+\d{1,3}.\d{1,3}.\d{1,3}.\d{1,3}\s+\w+\s+\w+\s+(up|down)\s+(up|down) — Kadir
– Kadir, Commented Jan 2, 2017 at 8:10
@Kadir, it worked modified below:- r'\w+[\d+/]+\s+(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})\s+\w+\s+\w+\s+(up|down)\s+(up|down)', line) any comments about the error on below which did not work: r'\w+\d+/?\d+?\s+(\d{1,3}\.){3} \d{1,3}\s+\w+\s+\w+\s+(up|down)\s+(up|down)', /?\d+? and [\d/]+ makes the diff — Raj Pathak
– Raj Pathak, Commented Jan 2, 2017 at 8:36

hiro protagonist · Accepted Answer · 2017-01-02 08:27:17Z

a very verbose version of what you are looking for (with named groups (?P<name>regex) for easy access of the matches):

import re

re_str = '''
(?P<name>[\w/]+)                            # the name (alphanum + _ + /)
\s+                                         # one or more spaces
(?P<IP>\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})  # IP address
\s+                                         # one or more spaces
(?P<yesno>YES|NO)                           # yes (or no?)
\s+                                         # one or more spaces
(?P<type>\w+)                               # type (?)
\s+                                         # one or more spaces
(up|down)                                   # up (or down?)
\s+                                         # one or more spaces
(up|down)                                   # up (or down?)
'''

regex = re.compile(re_str, flags=re.VERBOSE)

text = '''Loopback0 1.1.1.1 YES NVRAM up up
FastEthernet0/0 10.0.0.1 YES NVRAM up up
FastEthernet0/0 10.0.0.1 YES NVRAM up up'''

for line in text.split('\n'):
    match = regex.match(line)
    print(match.group('name'), match.group('IP'))

this prints

Loopback0 1.1.1.1
FastEthernet0/0 10.0.0.1
FastEthernet0/0 10.0.0.1

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