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From: Terry Reedy <tjreedy@udel.edu>
Subject: Re: re.sub(): replace longest match instead of leftmost match?
Date: Fri, 16 Dec 2011 17:26:03 -0500
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:17391

On 12/16/2011 1:36 PM, Roy Smith wrote:

> What you want is an IPv6 class which represents an address in some
> canonical form.  It would have constructors which accept any of the
> RFC-2373 defined formats.  It would also have string formatting methods
> to convert the internal form into any of these formats.
>
> Then, instead of attempting to regex your way directly from one string
> representation to another, you would do something like:
>
> addr_string = "FEDC:BA98:7654:3210:FEDC:BA98:7654:321"
> print IPv6(addr_string).to_short_form()

There are at least 2 third-party IP classes in use. I would not be 
surprised if at least one of them does this.

-- 
Terry Jan Reedy