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From: Ian Kelly <ian.g.kelly@gmail.com>
Date: Thu, 5 Jun 2014 18:05:34 -0600
Subject: Re: Unicode and Python - how often do you index strings?
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On Thu, Jun 5, 2014 at 2:34 PM, Albert-Jan Roskam <fomcl@yahoo.com> wrote:
>> If you want to be really picky about removing exactly one line
>> terminator, then this captures all the relatively modern variations:
>> re.sub('\r?\n$|\n?\r$', line, '', count=1)
>
> or perhaps: re.sub("[^ \S]+$", "", line)

That will remove more than one terminator, plus tabs. Points for
including \f and \v though.

I suppose if we want to be absolutely correct, we should follow the
Unicode standard:
re.sub(r'\r?\n$|[\r\v\f\x85\u2028\u2029]$', line, '', count=1)