Hi,

  I have a text file with more than 300K lines in it which I would like
to clean. Each line is of the form:

IP mm/dd/yy hh:mm

with IP being an standard IP address. This file is being populated by a
script which basically gets the IP and writes it at the end of the file.
But sometimes, this fails and I get a line with only the date and time.
My goal is to rid of these lines.

  I tried something like:

  :g!/^([0-9]{1,3}.)3.([0-9]{1,3})/d
  
  but it erases the whole file. I know that this regexp is not perfect
(it will also catch 999.999.999.999, which isn't a valid IP address),
but that doesn't seem to be the problem here.

  What's wrong?

  Thanks for any tips.

  Best,
  steve
  

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