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Date: Mon, 1 Jun 2015 15:29:30 -0500
From: Tim Chase <python.list@tim.thechases.com>
To: python-list@python.org
Subject: Pyton re module and POSIX equivalence classes
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Xref: csiph.com comp.lang.python:91723

Is Python supposed to support POSIX "equivalence classes"?  I tried
the following in Py2 and Py3:

  >>> re.sub('[[=3Da=3D]]', 'A', 'a=C3=A1=C3=A0=C3=A3=C3=A2=C3=A4', re.U)
  'a=C3=A1=C3=A0=C3=A3=C3=A2=C3=A4'

which suggests that it doesn't (I would have expected "AAAAAA" as the
result).

Is there a way to get this behavior?

I found that perl knows about them but treats them as an exception
for now[1].  Supposedly GNU awk (and other GNU POSIXish tools)
recognize character classes, as does vim.

Thanks,

-tkc



[1]
http://perldoc.perl.org/perlrecharclass.html