从多个字符串中提取Python

Question

I have list of amazon ip address which are formatted like "ip-xxxx.ap-southeast-1.compu" and like this "ip-xxxx.ec2.internal". I want to strip ".ap-southeast-1.compu" and ".ec2.internal" from ip address. I want to have ip address only (like ip-xxxx). I have tried rstrip but I am not finding way of giving multiple strings for rstrip. It should strip ip address if it finds ".ap-southeast-1.compu" or ".ec2.internal".

Please Let me know how this can be handled in python.

Answer 1

You can use string split function to split by dot char:

>>> ip = "ip-x-x-x-x.ap-southeast-1.compu"
>>> ip.split('.')[0]
'ip-x-x-x-x'

Answer 2

Might not be the most efficient way but I am a regular expression fan so figured I would show how to do it that way.

import re
NewIPs = []
regex = re.compile('(ip-\d*-\d*-\d*-\d*)')
for ip in IPList:
    NewIps.append(regex.search(ip).group(1))

That will go through your list of ips and fill a new list with the ips minus the endings.