title: Regular expression for isolating Comcast IP addresses in access log file for Apache
body: <p>Really the fact I want to use this for my Apache access log file is arbitrary and irrelevant, but it gives context to the situation.</p>
  
  <p>I need to filter out records associated with Comcast IP addresses.  Here's a <a href="http://postmaster.comcast.net/dynamic-IP-ranges.html" rel="nofollow">list of the dynamic IP address ranges</a> that Comcast assigns.  I need a regular expression that can match all of those, and only those.  I'll work on it on my own in the mean time but I figured there would be some RegEx guru out there on SO that would enjoy the problem.</p>