I would extract all the numbers after a symbol contained in a output. Which is the better suited for the purpose, regular expressions ?
for eg i have an output as 172.4.5.3/32 and i need to filter this output as /32
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syid
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something like this? https://stackoverflow.com/questions/19894329/finding-the-index-of-a-character-within-a-string – FObersteiner Aug 04 '20 at 10:31
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related? https://stackoverflow.com/questions/63244804/how-to-find-ip-address-using-regex – FObersteiner Aug 04 '20 at 10:32
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In this particular case, I'd go with Python's classes designed for dealing with IP addresses:
from ipaddress import IPv4Network
n = IPv4Network('172.4.5.3/32')
print(n.prefixlen)
deceze
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This splits the string into multiple strings (split where / occurs) and are put into an array. After this I select the last element of this array and prepend /.
input = "172.4.5.3/32"
output = '/' + input.split('/')[-1]
print(output)
output:
/32
tjallo
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You can split it on '/', or use re.findall.
re.findall('/.*', '172.4.5.3/32')[0]
outputs '/32'
rak1507
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Isn't it better to always grab the last element since `/*` will always be at the end of the string – tjallo Aug 04 '20 at 10:35
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Oh yeah, fair point, could replace [0] with [-1] then, but seeing as there should only be 1, it doesn't really matter. – rak1507 Aug 04 '20 at 10:36
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I agree with you that it probably doesn't happen. But better safe than sorry ;) – tjallo Aug 04 '20 at 11:03
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The python .split() method allows you to split a string into multiple items of a list, splitting on a separator of your choice.
ip_string = '172.4.5.3/32'
ip_subnet = ip_string.split('/')[1]
will fetch you your second value of that split string, i.e. the '32'
Daniel Ford
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