[docs] [issue25517] regex howto example in "Lookahead Assertions"

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Note that lookbehind assertions still are not documented in Regular Expression HOWTO.

The example that demonstrates negative lookahead assertion is ".*[.](?!bat$)[^.]*$". But then we should explain why ".*" is changed to "[^.]*".

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nosy: +akuchling, georg.brandl, serhiy.storchaka
stage:  -> needs patch
versions:  -Python 3.2, Python 3.3

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