[docs] [issue11283] incorrect pattern in the re module docs for conditional regex

[Terry J. Reedy]

Changes by Terry J. Reedy <tjreedy at udel.edu>:


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nosy: +pitrou
stage:  -> patch review
versions:  -Python 2.5, Python 2.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11283>
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