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Re: re.sub(): replace longest match instead of leftmost match?

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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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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

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Thread

re.sub(): replace longest match instead of leftmost match? John Gordon <gordon@panix.com> - 2011-12-16 16:49 +0000
  Re: re.sub(): replace longest match instead of leftmost match? Devin Jeanpierre <jeanpierreda@gmail.com> - 2011-12-16 11:56 -0500
    Re: re.sub(): replace longest match instead of leftmost match? John Gordon <gordon@panix.com> - 2011-12-16 21:04 +0000
      Re: re.sub(): replace longest match instead of leftmost match? MRAB <python@mrabarnett.plus.com> - 2011-12-16 21:36 +0000
        Re: re.sub(): replace longest match instead of leftmost match? Duncan Booth <duncan.booth@invalid.invalid> - 2011-12-19 15:46 +0000
  Re: re.sub(): replace longest match instead of leftmost match? MRAB <python@mrabarnett.plus.com> - 2011-12-16 17:36 +0000
  Re: re.sub(): replace longest match instead of leftmost match? Ian Kelly <ian.g.kelly@gmail.com> - 2011-12-16 10:57 -0700
  Re: re.sub(): replace longest match instead of leftmost match? Ian Kelly <ian.g.kelly@gmail.com> - 2011-12-16 10:59 -0700
    Re: re.sub(): replace longest match instead of leftmost match? John Gordon <gordon@panix.com> - 2011-12-16 21:06 +0000
  Re: re.sub(): replace longest match instead of leftmost match? MRAB <python@mrabarnett.plus.com> - 2011-12-16 18:19 +0000
  Re: re.sub(): replace longest match instead of leftmost match? Roy Smith <roy@panix.com> - 2011-12-16 13:36 -0500
    Re: re.sub(): replace longest match instead of leftmost match? John Gordon <gordon@panix.com> - 2011-12-16 21:07 +0000
    Re: re.sub(): replace longest match instead of leftmost match? Terry Reedy <tjreedy@udel.edu> - 2011-12-16 17:26 -0500
  Re: re.sub(): replace longest match instead of leftmost match? ting@thsu.org - 2011-12-19 15:15 -0800
    Re: re.sub(): replace longest match instead of leftmost match? Ian Kelly <ian.g.kelly@gmail.com> - 2011-12-19 19:58 -0700

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