Keep only the ips in a file



  • Hello, I have a file with more than +50.000 ips, and I need to clean all the stuff and only keep the ips. The file is:
    [2/3/2020 1:33:08 PM] 189.18.117.11:0 > 209.222.97.28:0, length: 12048
    [2/3/2020 1:33:08 PM] 94.233.27.82:0 > 209.222.97.28:0, length: 12112
    [2/3/2020 1:33:08 PM] 181.113.1.58:0 > 209.222.97.28:0, length: 12112
    [2/3/2020 1:33:08 PM] 2.95.120.211:0 > 209.222.97.28:0, length: 11664

    and I need the output to be like:
    189.18.117.11
    94.233.27.82
    181.113.1.58
    2.95.120.211
    ( Important to keep only the IP without the :0)
    Can someone help me? Thanks!



  • FIND = (?-s)^.* (\d+\.\d+\.\d+\.\d+):\d+ >.*$
    REPLACE = $1
    MODE = regular expression

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    Here is the way I usually break down trying to figure out a regex (whether it’s for myself or for helping someone in the forum):

    1. Compare what portions of each line I want to match is identical to every other one (“constants”), and what parts do I want to allow to be different in each line (“variables”) but still be part of the match.
    1. Look at both the variables and constants, and see what portions of each I’ll want to keep or move around, vs which parts get thrown away completely. Each sub-component that I want to keep will be put in a regex group. Anything that gets completely thrown away doesn’t need to be in a group, though sometimes I put it in a numbered (___) or unnumbered (?:___) group anyway, if I have a good reason for it. Anything that needs to be split apart, I break into multiple groups, instead of having it as one group.
    1. For each group, I do a mental “how would I describe to my son how to correctly match these characters?” – which should hopefully give me a simple, foolproof algorithm of characters that must match or must not match; then I ask, “how would I translate those instructions into regex sequences?” If I don’t know the answer to the second, I read documentation, or ask a specific question.
    1. try it, debug, iterate.


  • Thanks PeterJones! Works perfectly


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