Match only the IP addresses from the hosts file.

127.0.0.1 localhost
74.125.157.99 www.google.com
199.59.149.230 www.twitter.com
66.211.160.88 www.ebay.com


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Your answer is incorrect!
A possible solution is [0-9]{1,3}(.[0-9]{1,3}){3}
Your matches are:

Created by Ruud Jansen.