[issue2636] Adding a new regex module (compatible with re)

[Ezio Melotti]

Ezio Melotti <ezio.melotti at gmail.com> added the comment:

If these are the only 3 non-backward compatible features and the nested set one is moved under the NEW flag, I guess the approach might work without having per-feature flags.

The "NEW" could be kept for compatibility for regex (if necessary), possibly aliasing it with VERSION1 or whatever name wins the bikeshed.

If you want to control that at import time, maybe a from __future__ import new_re_semantics could be used instead of a flag, but I'm not sure about that.

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