Regexp syntax change in 1.6?

[effbot at pythonware.com]

gareth wrote:
> Well, (x?)? should be equivalent to (x)? or (x?), so
> perhaps it's reasonable to be issued a warning. An
> outright error seems rather harsh.

It's an overambitious sanity check in SRE's code generator.
It will be fixed in 2.0 final.

</F>

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