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Pyton re module and POSIX equivalence classes

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

  >>> re.sub('[[=a=]]', 'A', 'aáàãâä', re.U)
  'aáàãâä'

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

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Pyton re module and POSIX equivalence classes Tim Chase <python.list@tim.thechases.com> - 2015-06-01 15:29 -0500

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